Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Aug. 02, 2019
Entity Information [Line Items]
Entity Registrant Name	REGENCY CENTERS CORP
Entity Central Index Key	0000910606
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	REG
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		167,557,086
Entity File Number	1-12298
Entity Tax Identification Number	593191743
Entity Address, Address Line One	One Independent Drive
Entity Address, Address Line Two	Suite 114
Entity Address, City or Town	Jacksonville
Entity Address, State or Province	Florida
Entity Address, Postal Zip Code	32202
City Area Code	(904)
Local Phone Number	598-7000
Partnership Interest [Member]
Entity Information [Line Items]
Entity Registrant Name	REGENCY CENTERS LP
Entity Central Index Key	0001066247
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		167,557,086
Entity File Number	0-24763
Entity Tax Identification Number	593429602
Entity Address, Address Line One	One Independent Drive
Entity Address, Address Line Two	Suite 114
Entity Address, City or Town	Jacksonville
Entity Address, State or Province	Florida
Entity Address, Postal Zip Code	32202
City Area Code	(904)
Local Phone Number	598-7000

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	$ 10,878,303	$ 10,863,162
Less: accumulated depreciation	1,656,527	1,535,444
Real estate investments, net	9,221,776	9,327,718
Investments in real estate partnerships	465,495	463,001
Properties held for sale	15,106	60,516
Cash, cash equivalents and restricted cash (including $3,582 and $2,658 of restricted cash at June 30, 2019 and December 31, 2018, respectively)	37,364	45,190
Tenant and other receivables	157,883	172,359
Deferred leasing costs, less accumulated amortization of $104,972 and $101,093 at June 30, 2019 and December 31, 2018, respectively	81,183	84,983
Acquired lease intangible assets, less accumulated amortization of $237,924 and $219,689 at June 30, 2019 and December 31, 2018, respectively	262,553	387,069
Right of use assets, net	295,084	0
Other assets	410,745	403,827
Total assets	10,947,189	10,944,663
Liabilities:
Notes payable	2,994,495	3,006,478
Unsecured credit facilities	683,970	708,734
Accounts payable and other liabilities	188,723	224,807
Acquired lease intangible liabilities, less accumulated amortization of $106,286 and $92,746 at June 30, 2019 and December 31, 2018, respectively	457,667	496,726
Lease liabilities	223,959	0
Tenants’ security, escrow deposits and prepaid rent	45,527	57,750
Total liabilities	4,594,341	4,494,495
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
Common stock, $0.01 par value per share, 220,000,000 shares authorized; 167,555,322 and 167,904,593 shares issued at June 30, 2019 and December 31, 2018, respectively	1,676	1,679
Treasury stock at cost, 430,536 and 390,163 shares held at June 30, 2019 and December 31, 2018, respectively	(22,536)	(19,834)
Additional paid-in-capital	7,645,065	7,672,517
Accumulated other comprehensive (loss)	(14,086)	(927)
Distributions in excess of net income	(1,309,278)	(1,255,465)
Total stockholders’ equity	6,300,841	6,397,970
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $23,352 and $20,532 at June 30, 2019 and December 31, 2018, respectively	10,528	10,666
Limited partners’ interests in consolidated partnerships	41,479	41,532
Total noncontrolling interests	52,007	52,198
Total equity	6,352,848	6,450,168
Total liabilities and equity	10,947,189	10,944,663
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	10,878,303	10,863,162
Less: accumulated depreciation	1,656,527	1,535,444
Real estate investments, net	9,221,776	9,327,718
Investments in real estate partnerships	465,495	463,001
Properties held for sale	15,106	60,516
Cash, cash equivalents and restricted cash (including $3,582 and $2,658 of restricted cash at June 30, 2019 and December 31, 2018, respectively)	37,364	45,190
Tenant and other receivables	157,883	172,359
Deferred leasing costs, less accumulated amortization of $104,972 and $101,093 at June 30, 2019 and December 31, 2018, respectively	81,183	84,983
Acquired lease intangible assets, less accumulated amortization of $237,924 and $219,689 at June 30, 2019 and December 31, 2018, respectively	262,553	387,069
Right of use assets, net	295,084	0
Other assets	410,745	403,827
Total assets	10,947,189	10,944,663
Liabilities:
Notes payable	2,994,495	3,006,478
Unsecured credit facilities	683,970	708,734
Accounts payable and other liabilities	188,723	224,807
Acquired lease intangible liabilities, less accumulated amortization of $106,286 and $92,746 at June 30, 2019 and December 31, 2018, respectively	457,667	496,726
Lease liabilities	223,959	0
Tenants’ security, escrow deposits and prepaid rent	45,527	57,750
Total liabilities	4,594,341	4,494,495
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
General partner; 167,517,243 and 167,904,593 units outstanding atMarch 31, 2019 and December 31, 2018, respectively	6,314,927	6,398,897
Limited partners; 349,902 units outstanding at March 31, 2019 and December 31, 2018	10,528	10,666
Accumulated other comprehensive (loss)	(14,086)	(927)
Total partners’ capital	6,311,369	6,408,636
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	41,479	41,532
Total capital	6,352,848	6,450,168
Total liabilities and equity	$ 10,947,189	$ 10,944,663

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents	$ 3,582	$ 2,658
Deferred costs accumulated amortization	104,972	101,093
Accumulated amortization of acquired lease intangible assets	237,924	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 106,286	$ 92,746
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	167,555,322	167,904,593
Treasury stock, shares held at cost	430,536	390,163
Exchangeable operating partnership units aggregate redemption value	$ 23,352	$ 20,532
Partnership Interest [Member]
Restricted Cash and Cash Equivalents	3,582	2,658
Deferred costs accumulated amortization	104,972	101,093
Accumulated amortization of acquired lease intangible assets	237,924	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 106,286	$ 92,746
General partner units, outstanding	167,555,322	167,904,593
Limited partner units, outstanding	349,902	349,902

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Lease income	$ 266,236	$ 272,203	$ 543,539	$ 539,713
Other property income	2,194	2,322	4,176	4,347
Management, transaction, and other fees	7,442	6,887	14,415	14,045
Total revenues	275,872	281,412	562,130	558,105
Operating expenses:
Depreciation and amortization	93,589	89,105	190,783	177,629
Operating and maintenance	42,759	41,851	83,397	84,367
General and administrative	18,717	16,776	40,017	34,382
Real estate taxes	33,506	31,541	67,661	61,967
Other operating expenses	1,533	2,799	2,667	4,432
Total operating expenses	190,104	182,072	384,525	362,777
Other expense (income):
Interest expense, net	37,173	38,074	74,925	74,859
Provision for impairment, net of tax	10,441	12,533	12,113	28,587
Gain on sale of real estate, net of tax	(442)	(1,123)	(16,932)	(1,219)
Early extinguishment of debt		11,010	10,591	11,172
Net investment income	(966)	(569)	(3,320)	(602)
Total other expense (income)	46,206	59,925	77,377	112,797
Income from operations before equity in income of investments in real estate partnerships	39,562	39,415	100,228	82,531
Equity in income of investments in real estate partnerships	13,128	9,174	43,955	19,523
Net income	52,690	48,589	144,183	102,054
Noncontrolling interests:
Exchangeable operating partnership units	(109)	(100)	(299)	(212)
Limited partners’ interests in consolidated partnerships	(853)	(648)	(1,710)	(1,342)
Income attributable to noncontrolling interests	(962)	(748)	(2,009)	(1,554)
Net income attributable to common stockholders	$ 51,728	$ 47,841	$ 142,174	$ 100,500
Income per common share - basic	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Income per common share - diluted	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Partnership Interest [Member]
Revenues:
Lease income	$ 266,236	$ 272,203	$ 543,539	$ 539,713
Other property income	2,194	2,322	4,176	4,347
Management, transaction, and other fees	7,442	6,887	14,415	14,045
Total revenues	275,872	281,412	562,130	558,105
Operating expenses:
Depreciation and amortization	93,589	89,105	190,783	177,629
Operating and maintenance	42,759	41,851	83,397	84,367
General and administrative	18,717	16,776	40,017	34,382
Real estate taxes	33,506	31,541	67,661	61,967
Other operating expenses	1,533	2,799	2,667	4,432
Total operating expenses	190,104	182,072	384,525	362,777
Other expense (income):
Interest expense, net	37,173	38,074	74,925	74,859
Provision for impairment, net of tax	10,441	12,533	12,113	28,587
Gain on sale of real estate, net of tax	(442)	(1,123)	(16,932)	(1,219)
Early extinguishment of debt		11,010	10,591	11,172
Net investment income	(966)	(569)	(3,320)	(602)
Total other expense (income)	46,206	59,925	77,377	112,797
Income from operations before equity in income of investments in real estate partnerships	39,562	39,415	100,228	82,531
Equity in income of investments in real estate partnerships	13,128	9,174	43,955	19,523
Net income	52,690	48,589	144,183	102,054
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(853)	(648)	(1,710)	(1,342)
Income attributable to noncontrolling interests	(853)	(648)	(1,710)	(1,342)
Net income attributable to common unit holders	$ 51,837	$ 47,941	$ 142,473	$ 100,712
Income per common unit - basic	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Income per common unit - diluted	$ 0.31	$ 0.28	$ 0.85	$ 0.59

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income	$ 52,690	$ 48,589	$ 144,183	$ 102,054
Other comprehensive (loss) income:
Effective portion of change in fair value of derivative instruments	(9,227)	4,289	(14,716)	13,794
Reclassification adjustment of derivative instruments included in net income	584	1,415	408	3,553
Unrealized gain (loss) on available-for-sale debt securities	123	44	260	(75)
Other comprehensive (loss) income	(8,520)	5,748	(14,048)	17,272
Comprehensive income	44,170	54,337	130,135	119,326
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	962	748	2,009	1,554
Other comprehensive (loss) income attributable to noncontrolling interests	(529)	195	(889)	678
Comprehensive income attributable to noncontrolling interests	433	943	1,120	2,232
Comprehensive income attributable to the Company	43,737	53,394	129,015	117,094
Partnership Interest [Member]
Net income	52,690	48,589	144,183	102,054
Other comprehensive (loss) income:
Effective portion of change in fair value of derivative instruments	(9,227)	4,289	(14,716)	13,794
Reclassification adjustment of derivative instruments included in net income	584	1,415	408	3,553
Unrealized gain (loss) on available-for-sale debt securities	123	44	260	(75)
Other comprehensive (loss) income	(8,520)	5,748	(14,048)	17,272
Comprehensive income	44,170	54,337	130,135	119,326
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	853	648	1,710	1,342
Other comprehensive (loss) income attributable to noncontrolling interests	(512)	183	(861)	643
Comprehensive income attributable to noncontrolling interests	341	831	849	1,985
Comprehensive income attributable to the Company	$ 43,829	$ 53,506	$ 129,286	$ 117,341

Consolidated Statement of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Distributions in Excess of Net Income [Member]	Total Stockholders' Equity [Member]	Noncontrolling Interest Exchangeable Operating Partnership Units [Member]	Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2017	$ 6,733,054	$ 1,714	$ (18,307)	$ 7,873,104	$ (6,289)	$ (1,158,170)	$ 6,692,052	$ 10,907	$ 30,095	$ 41,002
Adjustment due to change inaccounting policy (note 1) at Dec. 31, 2017	30,903				12	30,889	30,901		2	2
Adjusted balance at Dec. 31, 2017	6,763,957	1,714	(18,307)	7,873,104	(6,277)	(1,127,281)	6,722,953	10,907	30,097	41,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102,054					100,500	100,500	212	1,342	1,554
Other comprehensive income	17,272				16,594		16,594	35	643	678
Deferred compensation plan, net	(4)		(961)	957			(4)
Restricted stock issued, net of amortization	8,135	1		8,134			8,135
Common stock redeemed for taxes withheld for stock based compensation, net	(6,540)			(6,540)			(6,540)
Common stock repurchased and retired	(124,989)	(21)		(124,968)			(124,989)
Common stock issued under dividend reinvestment plan	678			678			678
Common stock issued, net of issuance costs	10			10			10
Distributions to partners	(2,159)								(2,159)	(2,159)
Cash dividends declared - common stock/unit	(189,626)					(189,237)	(189,237)	(389)		(389)
Ending Balance at Jun. 30, 2018	6,568,788	1,694	(19,268)	7,751,375	10,317	(1,216,018)	6,528,100	10,765	29,923	40,688
Beginning balance at Mar. 31, 2018	6,605,381	1,694	(18,756)	7,746,427	4,764	(1,169,828)	6,564,301	10,847	30,233	41,080
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,589					47,841	47,841	100	648	748
Other comprehensive income	5,748				5,553		5,553	12	183	195
Deferred compensation plan, net	(1)		(512)	511			(1)
Restricted stock issued, net of amortization	4,014			4,014			4,014
Common stock redeemed for taxes withheld for stock based compensation, net	103			103			103
Common stock issued under dividend reinvestment plan	320			320			320
Distributions to partners	(1,141)								(1,141)	(1,141)
Cash dividends declared - common stock/unit	(94,225)					(94,031)	(94,031)	(194)		(194)
Ending Balance at Jun. 30, 2018	6,568,788	1,694	(19,268)	7,751,375	10,317	(1,216,018)	6,528,100	10,765	29,923	40,688
Beginning balance at Dec. 31, 2018	6,450,168	1,679	(19,834)	7,672,517	(927)	(1,255,465)	6,397,970	10,666	41,532	52,198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	144,183					142,174	142,174	299	1,710	2,009
Other comprehensive income	(14,048)				(13,159)		(13,159)	(28)	(861)	(889)
Deferred compensation plan, net	0		(2,702)	2,702
Restricted stock issued, net of amortization	7,904	3		7,901			7,904
Common stock redeemed for taxes withheld for stock based compensation, net	(5,957)			(5,957)			(5,957)
Common stock repurchased and retired	(32,778)	(6)		(32,772)			(32,778)
Common stock issued under dividend reinvestment plan	740			740			740
Contributions from partners	1,896								1,896	1,896
Distributions to partners	(2,864)								(2,864)	(2,864)
Reallocation of limited partner's interest	0			(66)			(66)		66	66
Cash dividends declared - common stock/unit	(196,396)					(195,987)	(195,987)	(409)		(409)
Ending Balance at Jun. 30, 2019	6,352,848	1,676	(22,536)	7,645,065	(14,086)	(1,309,278)	6,300,841	10,528	41,479	52,007
Beginning balance at Mar. 31, 2019	6,402,773	1,675	(21,226)	7,639,353	(6,096)	(1,263,011)	6,350,695	10,641	41,437	52,078
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52,690					51,728	51,728	109	853	962
Other comprehensive income	(8,520)				(7,990)		(7,990)	(17)	(513)	(530)
Deferred compensation plan, net	0		(1,310)	1,310
Restricted stock issued, net of amortization	3,952	1		3,951			3,952
Common stock redeemed for taxes withheld for stock based compensation, net	94			94			94
Common stock issued under dividend reinvestment plan	357			357			357
Contributions from partners	1,001								1,001	1,001
Distributions to partners	(1,299)								(1,299)	(1,299)
Cash dividends declared - common stock/unit	(98,200)					(97,995)	(97,995)	(205)		(205)
Ending Balance at Jun. 30, 2019	$ 6,352,848	$ 1,676	$ (22,536)	$ 7,645,065	$ (14,086)	$ (1,309,278)	$ 6,300,841	$ 10,528	$ 41,479	$ 52,007

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 52,690	$ 48,589	$ 144,183	$ 102,054
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			190,783	177,629
Amortization of deferred loan costs and debt premiums			5,911	4,999
(Accretion) and amortization of above and below market lease intangibles, net			(19,496)	(19,326)
Stock-based compensation, net of capitalization			6,989	6,574
Equity in income of investments in real estate partnerships	(13,128)	(9,174)	(43,955)	(19,523)
Gain on sale of real estate, net of tax			(16,932)	(1,219)
Provision for impairment, net of tax	10,441	12,533	12,113	28,587
Early extinguishment of debt		11,010	10,591	11,172
Distribution of earnings from operations of investments in real estate partnerships			25,659	26,711
Settlement of derivative instruments			(5,719)	0
Deferred compensation expense			3,297	544
Realized and unrealized gain on investments			(3,299)	(530)
Changes in assets and liabilities:
Tenant and other receivables			6,975	(3,802)
Deferred leasing costs			(4,782)	(3,404)
Other assets			(7,628)	(6,174)
Accounts payable and other liabilities			(3,292)	(6,052)
Tenants’ security, escrow deposits and prepaid rent			(12,075)	2,666
Net cash provided by operating activities			289,323	300,906
Cash flows from investing activities:
Acquisition of operating real estate			(19,302)	(85,766)
Advance deposits paid on acquisition of operating real estate			(11,000)	(2,025)
Real estate development and capital improvements			(80,032)	(120,579)
Proceeds from sale of real estate investments			83,460	42,508
Collection of notes receivable			0	15,648
Investments in real estate partnerships			(32,970)	(45,451)
Distributions received from investments in real estate partnerships			46,740	2,328
Dividends on investment securities			264	176
Acquisition of investment securities			(11,498)	(11,726)
Proceeds from sale of investment securities			10,828	10,976
Net cash used in investing activities			(13,510)	(193,911)
Cash flows from financing activities:
Repurchase of common shares in conjunction with equity award plans			(6,148)	(6,755)
Common shares repurchased through share repurchase program			(32,778)	(124,989)
Proceeds from sale of treasury stock			9	99
Distributions to limited partners in consolidated partnerships, net			(968)	(2,159)
Distributions to exchangeable operating partnership unit holders			(409)	(389)
Dividends paid to common stockholders			(195,246)	(188,559)
Repayment of fixed rate unsecured notes			(250,000)	(150,000)
Proceeds from issuance of fixed rate unsecured notes, net			298,983	299,511
Proceeds from unsecured credit facilities			185,000	400,000
Repayment of unsecured credit facilities			(210,000)	(310,000)
Proceeds from notes payable			0	1,740
Repayment of notes payable			(53,530)	(6,199)
Scheduled principal payments			(4,562)	(5,513)
Payment of loan costs			(3,343)	(9,432)
Early redemption costs			(10,647)	(10,491)
Net cash used in financing activities			(283,639)	(113,136)
Net decrease in cash and cash equivalents and restricted cash			(7,826)	(6,141)
Cash and cash equivalents and restricted cash at beginning of the period			45,190	49,381	$ 49,381
Cash and cash equivalents and restricted cash at end of the period	37,364	43,240	37,364	43,240	45,190
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,996 and $4,150 in 2019 and 2018, respectively)			68,351	66,692
Cash paid for income taxes, net of refunds			459	290
Supplemental disclosure of non-cash transactions:
Mortgage loans assumed for the acquisition of real estate				9,700
Change in accrued capital expenditures			9,149
Common stock issued by Parent Company for dividend reinvestment plan	357	320	740	678
Stock-based compensation capitalized			1,105	1,777
Contributions from limited partners in consolidated partnerships, net			66
Common stock issued for dividend reinvestment in trust			479	415
Contribution of stock awards into trust			2,397	1,174
Distribution of stock held in trust			167	524
Change in fair value of debt securities available-for-sale			260	(89)
Partnership Interest [Member]
Cash flows from operating activities:
Net income	52,690	48,589	144,183	102,054
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			190,783	177,629
Amortization of deferred loan costs and debt premiums			5,911	4,999
(Accretion) and amortization of above and below market lease intangibles, net			(19,496)	(19,326)
Stock-based compensation, net of capitalization			6,989	6,574
Equity in income of investments in real estate partnerships	(13,128)	(9,174)	(43,955)	(19,523)
Gain on sale of real estate, net of tax			(16,932)	(1,219)
Provision for impairment, net of tax	10,441	12,533	12,113	28,587
Early extinguishment of debt		11,010	10,591	11,172
Distribution of earnings from operations of investments in real estate partnerships			25,659	26,711
Settlement of derivative instruments			(5,719)	0
Deferred compensation expense			3,297	544
Realized and unrealized gain on investments			(3,299)	(530)
Changes in assets and liabilities:
Tenant and other receivables			6,975	(3,802)
Deferred leasing costs			(4,782)	(3,404)
Other assets			(7,628)	(6,174)
Accounts payable and other liabilities			(3,292)	(6,052)
Tenants’ security, escrow deposits and prepaid rent			(12,075)	2,666
Net cash provided by operating activities			289,323	300,906
Cash flows from investing activities:
Acquisition of operating real estate			(19,302)	(85,766)
Advance deposits paid on acquisition of operating real estate			(11,000)	(2,025)
Real estate development and capital improvements			(80,032)	(120,579)
Proceeds from sale of real estate investments			83,460	42,508
Issuance of notes receivable			0	15,648
Investments in real estate partnerships			(32,970)	(45,451)
Distributions received from investments in real estate partnerships			46,740	2,328
Dividends on investment securities			264	176
Acquisition of investment securities			(11,498)	(11,726)
Proceeds from sale of investment securities			10,828	10,976
Net cash used in investing activities			(13,510)	(193,911)
Cash flows from financing activities:
Repurchase of common shares in conjunction with equity award plans			(6,148)	(6,755)
Common shares repurchased through share repurchase program			(32,778)	(124,989)
Proceeds from sale of treasury stock			9	99
Distributions to limited partners in consolidated partnerships, net			(968)	(2,159)
Dividends paid to common stockholders			(195,655)	(188,948)
Repayment of fixed rate unsecured notes			(250,000)	(150,000)
Proceeds from issuance of fixed rate unsecured notes, net			298,983	299,511
Proceeds from unsecured credit facilities			185,000	400,000
Repayment of unsecured credit facilities			(210,000)	(310,000)
Proceeds from notes payable			0	1,740
Repayment of notes payable			(53,530)	(6,199)
Scheduled principal payments			(4,562)	(5,513)
Payment of loan costs			(3,343)	(9,432)
Early redemption costs			(10,647)	(10,491)
Net cash used in financing activities			(283,639)	(113,136)
Net decrease in cash and cash equivalents and restricted cash			(7,826)	(6,141)
Cash and cash equivalents and restricted cash at beginning of the period			45,190	49,381	49,381
Cash and cash equivalents and restricted cash at end of the period	$ 37,364	$ 43,240	37,364	43,240	$ 45,190
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,996 and $4,150 in 2019 and 2018, respectively)			68,351	66,692
Cash paid for income taxes, net of refunds			459	290
Supplemental disclosure of non-cash transactions:
Mortgage loans assumed for the acquisition of real estate				9,700
Change in accrued capital expenditures			9,149
Common stock issued by Parent Company for dividend reinvestment plan			740	678
Stock-based compensation capitalized			1,105	1,777
Contributions from limited partners in consolidated partnerships, net			66
Common stock issued for dividend reinvestment in trust			479	415
Contribution of stock awards into trust			2,397	1,174
Distribution of stock held in trust			167	524
Change in fair value of debt securities available-for-sale			$ 260	$ (89)

Consolidated Statement of Changes in Partner Capital Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Adjustment due to change inaccounting policy (note 1)				$ 30,903
Net income	$ 52,690	$ 48,589	$ 144,183	102,054
Other comprehensive income	(8,520)	5,748	(14,048)	17,272
Contributions from partners	1,001		1,896
Distributions to partners	(1,299)	(1,141)	(2,864)	(2,159)
Reallocation of limited partner's interest			0
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	3,952	4,014	7,904	8,135
Partners Capital Total [Member]
Adjustment due to change inaccounting policy (note 1)				30,901
Net income	51,728	47,841	142,174	100,500
Other comprehensive income	(7,990)	5,553	(13,159)	16,594
Reallocation of limited partner's interest			66
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	3,952	4,014	7,904	8,135
Partnership Interest [Member]
Beginning Balance	6,402,773	6,605,381	6,450,168	6,733,054
Adjustment due to change inaccounting policy (note 1)				30,903
Adjusted balance				6,763,957
Net income	52,690	48,589	144,183	102,054
Other comprehensive income	(8,520)	5,748	(14,048)	17,272
Deferred compensation plan, net		(1)		(4)
Contributions from partners	1,001		1,896
Distributions to partners	(99,499)	(95,366)	(199,260)	(191,785)
Reallocation of limited partner's interest			0
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	3,952	4,014	7,904	8,135
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company			(32,778)	(124,989)
Common units issued as a result of common stock issued by Parent Company, net of repurchases		423		(5,852)
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	451		(5,217)
Ending Balance	6,352,848	6,568,788	6,352,848	6,568,788
Partnership Interest [Member] \| Partners Capital Total [Member]
Beginning Balance	6,361,336	6,575,148	6,408,636	6,702,959
Adjustment due to change inaccounting policy (note 1)				30,901
Adjusted balance				6,733,860
Net income	51,837	47,941	142,473	100,712
Other comprehensive income	(8,007)	5,565	(13,187)	16,629
Deferred compensation plan, net		(1)		(4)
Contributions from partners	0		0
Distributions to partners	(98,200)	(94,225)	(196,396)	(189,626)
Reallocation of limited partner's interest			(66)
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	3,952	4,014	7,904	8,135
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company			(32,778)	(124,989)
Common units issued as a result of common stock issued by Parent Company, net of repurchases		423		(5,852)
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	451		(5,217)
Ending Balance	6,311,369	6,538,865	6,311,369	6,538,865
Partnership Interest [Member] \| AOCI Attributable to Parent [Member]
Beginning Balance	(6,096)	4,764	(927)	(6,289)
Adjustment due to change inaccounting policy (note 1)				12
Adjusted balance				(6,277)
Net income	0	0	0	0
Other comprehensive income	(7,990)	5,553	(13,159)	16,594
Deferred compensation plan, net		0		0
Contributions from partners	0		0
Distributions to partners	0	0	0	0
Reallocation of limited partner's interest			0
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	0	0	0	0
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company			0	0
Common units issued as a result of common stock issued by Parent Company, net of repurchases		0		0
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	0		0
Ending Balance	(14,086)	10,317	(14,086)	10,317
Partnership Interest [Member] \| Noncontrolling Interest [Member]
Beginning Balance	41,437	30,233	41,532	30,095
Adjustment due to change inaccounting policy (note 1)				2
Adjusted balance				30,097
Net income	853	648	1,710	1,342
Other comprehensive income	(513)	183	(861)	643
Deferred compensation plan, net		0		0
Contributions from partners	1,001		1,896
Distributions to partners	(1,299)	(1,141)	(2,864)	(2,159)
Reallocation of limited partner's interest			66
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	0	0	0	0
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company			0	0
Common units issued as a result of common stock issued by Parent Company, net of repurchases		0		0
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	0		0
Ending Balance	41,479	29,923	41,479	29,923
Partnership Interest [Member] \| General Partner [Member]
Beginning Balance	6,356,791	6,559,537	6,398,897	6,698,341
Adjustment due to change inaccounting policy (note 1)				30,889
Adjusted balance				6,729,230
Net income	51,728	47,841	142,174	100,500
Other comprehensive income	0	0	0	0
Deferred compensation plan, net		(1)		(4)
Contributions from partners	0		0
Distributions to partners	(97,995)	(94,031)	(195,987)	(189,237)
Reallocation of limited partner's interest			(66)
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	3,952	4,014	7,904	8,135
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company			(32,778)	(124,989)
Common units issued as a result of common stock issued by Parent Company, net of repurchases		423		(5,852)
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	451		(5,217)
Ending Balance	6,314,927	6,517,783	6,314,927	6,517,783
Partnership Interest [Member] \| Limited Partner [Member]
Beginning Balance	10,641	10,847	10,666	10,907
Adjustment due to change inaccounting policy (note 1)				0
Adjusted balance				10,907
Net income	109	100	299	212
Other comprehensive income	(17)	12	(28)	35
Deferred compensation plan, net		0		0
Contributions from partners	0		0
Distributions to partners	(205)	(194)	(409)	(389)
Reallocation of limited partner's interest			0
Restricted units issued as a result of amortization of restricted stock issued by Parent Company, net of amortization	0	0	0	0
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company			0	0
Common units issued as a result of common stock issued by Parent Company, net of repurchases		0		0
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	0		0
Ending Balance	$ 10,528	$ 10,765	$ 10,528	$ 10,765

Organization and Principles of Consolidation

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Organization and Principles of Consolidation

1.	Organization and Significant Accounting Policies

General

Regency Centers Corporation (the “Parent Company”) began its operations as a Real Estate Investment Trust (“REIT”) in 1993 and is the general partner of Regency Centers, L.P. (the “Operating Partnership”). The Parent Company primarily engages in the ownership, management, leasing, acquisition, and development and redevelopment of shopping centers through the Operating Partnership, and has no other assets other than through its investment in the Operating Partnership, and its only liabilities are $500 million of unsecured public and private placement notes, which are co-issued and guaranteed by the Operating Partnership. The Parent Company guarantees all of the unsecured debt of the Operating Partnership.

As of June 30, 2019, the Parent Company, the Operating Partnership, and their controlled subsidiaries on a consolidated basis owned 304 properties and held partial interests in an additional 117 properties through unconsolidated investments in real estate partnerships (also referred to as "joint ventures" or "investment partnerships").

The consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary to fairly state the results for the interim periods presented. These adjustments are considered to be of a normal recurring nature.

Consolidation

The Company consolidates properties that are wholly-owned and properties where it owns less than 100%, but which it has control over the activities most important to the overall success of the partnership. Control is determined using an evaluation based on accounting standards related to the consolidation of Variable Interest Entities ("VIEs") and voting interest entities.

Ownership of the Operating Partnership

The Operating Partnership’s capital includes general and limited common Partnership Units. As of June 30, 2019, the Parent Company owned approximately 99.8% of the outstanding common Partnership Units of the Operating Partnership with the remaining limited common Partnership Units held by third parties (“Exchangeable operating partnership units” or “EOP units”). The EOP units are exchangeable for cash or one share of common stock of the Parent Company, at the discretion of the Parent Company, and the unit holder cannot require redemption in cash or other assets. The Parent Company classifies EOP units as permanent equity in the accompanying Consolidated Balance Sheets and Consolidated Statements of Equity and Comprehensive Income. The Parent Company serves as general partner of the Operating Partnership. The EOP unit holders have limited rights over the Operating Partnership such that they do not have the power to direct the activities of the Operating Partnership. As such, the Operating Partnership is considered a VIE, and the Parent Company, which consolidates it, is the primary beneficiary. The Parent Company’s only investment is the Operating Partnership. Net income and distributions of the Operating Partnership are allocable to the general and limited common Partnership Units in accordance with their ownership percentages.

Real Estate Partnerships

As of June 30, 2019, Regency had a partial ownership interest in 129 properties through partnerships, of which 12 are consolidated. Regency's partners include institutional investors, other real estate developers and/or operators, and individual parties who had a role in Regency sourcing transactions for development and investment (the "Partners" or "limited partners"). Regency has a variable interest in these entities through its equity interests, with Regency the primary beneficiary in certain of these real estate partnerships. As such, Regency consolidates the partnerships for which it is the primary beneficiary and reports the limited partners’ interests as noncontrolling interests. For those partnerships which Regency is not the primary beneficiary and does not control, but has significant influence, Regency recognizes its investment in them using the equity method of accounting.

The assets of these partnerships are restricted to the use of the partnerships and cannot be used by general creditors of the Company. And similarly, the obligations of the partnerships can only be settled by the assets of these partnerships.

The major classes of assets, liabilities, and non-controlling equity interests held by the Company's consolidated VIEs, exclusive of the Operating Partnership, are as follows:

(in thousands)	June 30, 2019		December 31, 2018
Assets
Net real estate investments	$	116,894		112,085
Cash, cash equivalents and restricted cash		4,022		7,309
Liabilities
Notes payable		17,657		18,432
Equity
Limited partners’ interests in consolidated partnerships		31,058		30,280

Leases

Lease Income and Tenant Receivables

The Company leases space to tenants under agreements with varying terms that generally provide for fixed payments of base rent, with designated increases over the term of the lease. Some of the lease agreements contain provisions that provide for additional rents based on tenants' sales volume ("percentage rent"). Percentage rents are recognized when the tenants achieve the specified targets as defined in their lease agreements. Additionally, most lease agreements contain provisions for reimbursement of the tenants' share of actual real estate taxes, insurance and common area maintenance (“CAM”) costs (collectively "Recoverable Costs") incurred.

Lease terms generally range from three to seven years for tenant space under 10,000 square feet (“Shop Space”) and in excess of five years for spaces greater than 10,000 square feet (“Anchor Tenants”). Many leases also provide the option for the tenants to extend their lease beyond the initial term of the lease. If a tenant does not exercise its option or otherwise negotiate to renew, the lease expires and the lease contains an obligation for the tenant to relinquish its space so it can be leased to a new tenant. This generally involves some level of cost to prepare the space for re-leasing, which is capitalized and depreciated over the shorter of the life of the subsequent lease or the life of the improvement.

On January 1, 2019, the Company adopted the new accounting guidance in Accounting Standards Codification (“ASC”) Topic 842, Leases, including all related Accounting Standard Updates (“ASU”). The Company elected to use the alternative modified retrospective transition method provided in ASU 2018-11 (the "effective date method"). Under this method, the effective date of January 1, 2019 is the date of initial application. In connection with the adoption of Topic 842, the Company elected a package of practical expedients, transition options, and accounting policy elections as follows:

•

Package of practical expedients - applied to all leases, allowing the Company not to reassess (i) whether expired or existing contracts contain leases under the new definition of a lease, (ii) lease classification for expired or existing leases, and (iii) whether previously capitalized initial direct costs would qualify for capitalization under Topic 842;

•

For land easements, the Company elected not to assess at transition whether any expired or existing land easements are, or contain, leases if they were not previously accounted for as leases under the previous lease accounting standard ("Topic 840");

•

Lessor separation and allocation practical expedient - Regency elected, as lessor, to aggregate non-lease components with the related lease component if certain conditions are met, and account for the combined component based on its predominant characteristic, which generally results in combining lease and non-lease components of its tenant lease contracts to a single line shown as Lease income in the accompanying Consolidated Statements of Operations; and

•

The Company made an accounting policy election to continue to exclude, from contract consideration, sales tax (and similar taxes) collected from lessees.

The Company's existing leases were not re-evaluated and continue to be classified as operating leases, as per the practical expedient package elected above. New and modified leases will now require evaluation of specific classification criteria, which, based on the customary terms of the Company's leases, should continue to be classified as operating leases. However, certain longer-term leases (both lessee and lessor leases) may be classified as direct financing or sales type leases, which may result in selling profit and an accelerated pattern of earnings recognition. On June 30, 2019, all of the Company’s leases were classified as operating leases.

CAM is a non-lease component of the lease contract under Topic 842, and therefore would be accounted for under Topic 606, Revenue from Contracts with Customers, and presented separate from Lease income in the Consolidated Statements of Operations, based on an allocation of the overall contract price, which is not necessarily the amount that would be billable to the tenants for CAM reimbursements per the terms of the lease contract. As the timing and pattern of providing the CAM service to the tenant is the same as the timing and pattern of the tenants' use of the underlying lease asset, the Company elected, as part of a practical expedient referred to above, to combine CAM with the remaining lease components, along with tenants' reimbursement of real estate taxes and insurance, and recognize them together as Lease income in the accompanying Consolidated Statements of Operations.

Lease income for operating leases with fixed payment terms is recognized on a straight-line basis over the expected term of the lease for all leases for which collectibility is considered probable at the commencement date. At lease commencement, the Company generally expects that collectibility is probable due to the Company’s credit checks on tenants and other creditworthiness analysis undertaken before entering into a new lease; therefore, income from most operating leases is initially recognized on a straight-line basis. For operating leases in which collectibility of Lease income is not considered probable, Lease income is recognized on a cash basis and all previously recognized uncollectible Lease income is reversed in the period in which the Lease income is determined not to be probable of collection. In addition to the lease-specific collectability assessment performed under Topic 842, the Company also recognizes a general reserve, as a reduction to Lease income, for its portfolio of operating lease receivables which are not expected to be fully collectible based on the Company’s historical collection experience.

Topic 842 also changes the treatment of leasing costs, such that non-contingent internal leasing and legal costs associated with leasing activities can no longer be capitalized. The Company, as a lessor, may only defer as initial direct costs the incremental costs of a tenant operating lease that would not have been incurred if the lease had not been obtained. These costs generally include third party broker payments, which are capitalized to Deferred leasing costs in the accompanying Consolidated Balance Sheets and amortized over the expected term of the lease to Depreciation and amortization expense in the accompanying Consolidated Statements of Operations.

Lease Obligations

The Company has certain properties within its consolidated real estate portfolio that are either partially or completely on land subject to ground leases with third parties, which are all classified as operating leases. Accordingly, the Company owns only a long-term leasehold or similar interest in these properties. The building and improvements constructed on the leased land are capitalized as Real estate assets in the accompanying Consolidated Balance Sheets and depreciated over the shorter of the useful life of the improvements or the lease term.

In addition, the Company has non-cancelable operating leases pertaining to office space from which it conducts its business. Leasehold improvements are capitalized as tenant improvements, included in Other assets in the Consolidated Balance Sheets, and depreciated over the shorter of the useful life of the improvements or the lease term.

Upon the adoption of Topic 842 the Company has recognized Lease liabilities on its Consolidated Balance Sheets for its ground and office leases of $225.4 million at January 1, 2019, and corresponding Right of use assets of $297.8 million, net of or including the opening balance for straight line rent and above / below market ground lease intangibles related to these same ground and office leases. A key input in estimating the Lease liabilities and resulting Right of use assets is establishing the discount rate in the lease, which requires additional inputs for the longer-term ground leases, including interest rates that correspond with the remaining term of the lease, the Company's credit spread, and a securitization adjustment necessary to reflect the collateralized payment terms present in the lease.

The ground and office lease expenses continue to be recognized on a straight line basis over the term of the leases, including management's estimate of expected option renewal periods. For ground leases, the Company generally assumes it will exercise options through the latest option date of that shopping center's anchor tenant lease. See Note 7, Leases, for additional disclosures.

Revenues and Other Receivables

Other property income includes incidental income from the properties and is generally recognized at the point in time that the performance obligation is met. All income from contracts with the Company's real estate partnerships is included within Management, transaction and other fees on the Consolidated Statements of Operations. The primary components of these revenue streams, the timing of satisfying the performance obligations, and amounts recognized are as follows:

		Three months ended June 30,				Six months ended June 30,
(in thousands)	Timing of satisfaction of performance obligations	2019		2018		2019		2018
Other property income	Point in time	$	2,194		2,322	$	4,176		4,347
Management, transaction and other fees
Property management services	Over time		3,665		3,652		7,428		7,420
Asset management services	Over time		1,760		1,804		3,538		3,507
Leasing services	Point in time		705		1,072		1,463		1,757
Other transaction fees	Point in time		1,312		359		1,986		1,361
Total management, transaction, and other fees		$	7,442		6,887	$	14,415		14,045

The accounts receivable for the above Other property income and management services, which are included within Tenant and other receivables in the accompanying Consolidated Balance Sheets, are $11.0 million and $12.5 million, as of June 30, 2019 and December 31, 2018, respectively.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation, including amounts in Cash, cash equivalents, and restricted cash in the accompanying Consolidated Balance Sheets, and in Lease income and Other property income in the accompanying Consolidated Statements of Operations.

Recent Accounting Pronouncements

The following table provides a brief description of recent accounting pronouncements and expected impact on our financial statements:




Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Recently adopted:

Leases (Topic 842) and related updates: ASU 2016-02, February 2016, Leases (Topic 842) ASU 2018-10, July 2018: Codification Improvements to Topic 842, Leases ASU 2018-11, July 2018, Leases (Topic 842): Targeted Improvements ASU 2018-20, December 2018, Leases (Topic 842) : Narrow-Scope Improvements for Lessors ASU 2019-01, March 2019, Leases (Topic 842) : Codification Improvements	Topic 842 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. It also makes targeted changes to lessor accounting. The provisions of these ASUs are effective as of January 1, 2019, with early adoption permitted. Topic 842 provides a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief or an additional transition method, allowing for initial application at the date of adoption and a cumulative-effect adjustment to opening retained earnings. See the updated Leases accounting policy disclosed earlier in Note 1 and the added Leases disclosures in Note 7.	January 2019	The Company has completed its evaluation and adoption of this standard, as discussed earlier in Note 1. The Company utilized the alternative modified retrospective transition method provided in ASU 2018-11 (the "effective date method"), under which the effective date of January 1, 2019 is also the date of initial application. See the updated Leases accounting policy disclosed earlier in Note 1 and the added disclosures in Note 7, Leases. Beyond the policy, presentation and disclosure changes discussed, the following changes had a direct impact to Net Income from the adoption of Topic 842: Capitalization of indirect internal non-contingent leasing costs and legal leasing costs are no longer permitted upon the adoption of this standard, which is resulting in an increase to Total operating expenses in the Consolidated Statements of Operations. Previous capitalization of internal leasing costs was $6.5 million during the year ended December 31, 2018. Previous capitalization of legal costs was $1.6 million during the year ended December 31, 2018, including our pro rata share recognized through Equity in income of investments in real estate partnerships.




Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Not yet adopted:

ASU 2016-13, June 2016, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	This ASU replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This ASU also applies to how the Company evaluates impairments of any held to maturity debt securities.	January 2020	The Company is currently evaluating the accounting standard, but does not expect the adoption to have a material impact on its financial position, results of operations, or cash flows.

ASU 2018-19, November 2018: Codification Improvements to Topic 326, Financial Instruments - Credit Losses	This ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases.	January 2020	The Company currently does not expect the adoption of this ASU to have a material impact on its financial statements and related disclosures. See Leases section of Note 1 for disclosure of collectibility policy over lease receivables from operating leases.

ASU 2018-13, August 2018, Fair Value Measurements (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	This ASU modifies the disclosure requirements for fair value measurements within the scope of Topic 820, Fair Value Measurements, including the removal and modification of certain existing disclosures, and the addition of new disclosures.	January 2020	The Company is currently evaluating the impact of adopting this new accounting standard, which is expected to only impact fair value measurement disclosures and therefore should have no impact on the Company's financial position, results of operations, or cash flows.

ASU 2018-15, August 2018, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.	The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The ASU provides further clarification of the appropriate presentation of capitalized costs, the period over which to recognize the expense, the presentation within the Statements of Operations and Statements of Cash Flows, and the disclosure requirements. Early adoption of the standard is permitted.	January 2020	The Company is currently evaluating the accounting standard, but does not expect the adoption to have a material impact on its financial position, results of operations, or cash flows.

Real Estate Investments

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

Real Estate Investments

2.	Real Estate Investments

The following tables detail the shopping centers acquired or land acquired or leased for development or redevelopment:

(in thousands)		Six months ended June 30, 2019
Date Purchased	Property Name	City/State	Property Type	Ownership	Purchase Price		Debt Assumed, Net of Premiums		Intangible Assets		Intangible Liabilities
1/8/19	Pablo Plaza ⁽¹⁾	Jacksonville, FL	Operating	100%	$	600		—		—		—
2/8/19	Melrose Market	Seattle, WA	Operating	100%		15,515		—		941		358
6/18/19	The Field at Commonwealth Ph II ⁽²⁾	Chantilly, VA	Development	100%		4,083		—		—		—
6/21/19	Culver Public Market	Culver City, CA	Development	100%		1,279		—		—		—
6/28/19	6401 Roosevelt	Seattle, WA	Operating	100%		3,550		—		—		—
Total property acquisitions					$	25,027		—		941		358

⁽¹⁾ The Company purchased a .17 acre land parcel adjacent to the Company's existing operating Pablo Plaza for redevelopment.

⁽²⁾ The Company purchased The Field at Commonwealth Ph II, which is land adjacent to an existing operating property, for future development.

Subsequent to the balance sheet date, on July 1, 2019, the Company acquired a 100% interest in a 258,000 SF retail operating property, The Pruneyard, in Campbell, CA for a purchase price of $212.5 million.

(in thousands)		Six months ended June 30, 2018
Date Purchased	Property Name	City/State	Property Type	Ownership	Purchase Price		Debt Assumed, Net of Premiums		Intangible Assets		Intangible Liabilities
1/2/18	Ballard Blocks I	Seattle, WA	Operating	49.9%	$	54,500		—		3,668		2,350
1/2/18	Ballard Blocks II	Seattle, WA	Development	49.9%		4,000		—		—		—
1/5/18	Metuchen	Metuchen, NJ	Operating	20%		33,830		—		3,147		1,905
1/10/18	Hewlett Crossing I & II	Hewlett, NY	Operating	100%		30,900		9,700		3,114		1,868
4/3/18	Rivertowns Square	Dobby Ferry, NY	Operating	100%		68,933		—		4,993		5,554
5/18/18	Crossroads Commons II	Boulder, CO	Operating	20%		10,500		—		447		769
Total property acquisitions					$	202,663		9,700		15,369		12,446

Property Dispositions

6 Months Ended

Jun. 30, 2019

Discontinued Operations And Disposal Groups [Abstract]

Property Dispositions

3.	Property Dispositions

Dispositions

The following table provides a summary of consolidated shopping centers and land parcels disposed of during the periods set forth below:

	Three months ended June 30,						Six months ended June 30,
(in thousands, except number sold data)	2019			2018			2019			2018
Net proceeds from sale of real estate investments	$	927			38,781		$	83,460			42,008
Gain on sale of real estate, net of tax		442			1,123			16,932			1,219
Provision for impairment of real estate sold		(6	)		2,974			1,666			3,348
Number of operating properties sold		-			3			4			4
Number of land parcels sold		1			3			3			3
Percent interest sold		100	%		100	%		100	%		100	%

At June 30, 2019, the Company also had one property classified within Properties held for sale on the Consolidated Balance Sheets.

Other Assets Other Assets (Notes)

6 Months Ended

Jun. 30, 2019

Other Assets [Abstract]

Other Assets Disclosure [Text Block]

4.	Other Assets

The following table represents the components of Other assets in the accompanying Consolidated Balance Sheets:

(in thousands)	June 30, 2019		December 31, 2018
Goodwill, net	$	313,180		314,143
Investments		45,244		41,287
Prepaid and other		35,595		17,937
Derivative assets		4,367		17,482
Furniture, fixtures, and equipment, net		6,590		6,127
Deferred financing costs, net		5,769		6,851
Total other assets	$	410,745		403,827

The following table presents the goodwill balances and activity during the year to date periods ended:

	June 30, 2019									December 31, 2018
(in thousands)	Goodwill			Accumulated Impairment Losses			Total			Goodwill			Accumulated Impairment Losses			Total
Beginning of year balance	$	316,858			(2,715	)		314,143		$	331,884			—			331,884
Goodwill additions		—			—			—			500			—			500
Goodwill allocated to Provision for impairment		—			(963	)		(963	)		—			(12,628	)		(12,628	)
Goodwill allocated to Properties held for sale		—			—			—			(1,159	)		—			(1,159	)
Goodwill associated with disposed reporting units:
Goodwill allocated to Provision for impairment		(1,779	)		1,779			—			(9,913	)		9,913			—
Goodwill allocated to Gain on sale of real estate		(527	)		527			—			(4,454	)		—			(4,454	)
End of period balance	$	314,552			(1,372	)		313,180		$	316,858			(2,715	)		314,143

As the Company identifies properties ("reporting units") that no longer meet its investment criteria, it will evaluate the property for potential sale. A decision to sell a reporting unit results in the need to evaluate its goodwill for recoverability and may result in impairment. If events occur that trigger an impairment evaluation at multiple reporting units, a goodwill impairment may be significant.

Notes Payable and Unsecured Credit Facilities

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Notes Payable and Unsecured Credit Facilities

5.	Notes Payable and Unsecured Credit Facilities

The Company’s outstanding debt consisted of the following:

(in thousands)	Weighted Average Contractual Rate	Weighted Average Effective Rate	June 30, 2019		December 31, 2018
Notes payable:
Fixed rate mortgage loans	4.5%	4.0%	$	344,963		403,306
Variable rate mortgage loans ⁽¹⁾	3.5%	3.6%		127,018		127,850
Fixed rate unsecured public and private debt	4.0%	4.4%		2,522,514		2,475,322
Total notes payable				2,994,495		3,006,478
Unsecured credit facilities:
Line of Credit (the "Line") ⁽²⁾	3.4%	3.6%		120,000		145,000
Term loans	2.4%	2.5%		563,970		563,734
Total unsecured credit facilities				683,970		708,734
Total debt outstanding			$	3,678,465		3,715,212

⁽¹⁾ Includes five mortgages whose interest rates vary on LIBOR based formulas. Three of these variable rate loans have interest rate swaps in place to fix the interest rates at a range of 2.8% to 4.1%.

⁽²⁾ Weighted average effective and contractual rate for the Line is calculated based on a fully drawn Line balance.

Significant financing activity during 2019 includes:

•

On March 6, 2019, the Company issued $300 million of 4.65% senior unsecured public notes, which priced at 99.661%, and mature in March 2049. The net proceeds of the offering were used to repay in full its outstanding $250 million 4.8% notes due April 15, 2021, including a make-whole premium of approximately $9.6 million and accrued interest, with the remaining proceeds used toward repaying in full two mortgages totaling $52.7 million with interest rates ranging between 6.25% and 7.25%, including a prepayment premium of $1 million.

As of June 30, 2019, scheduled principal payments and maturities on notes payable and unsecured credit facilities were as follows:

(in thousands)	June 30, 2019
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities		Unsecured Maturities ⁽¹⁾			Total
2019 ⁽²⁾	$	4,924		—		—			4,924
2020		11,287		39,074		300,000			350,361
2021		11,599		76,251		—			87,850
2022		11,798		5,848		685,000			702,646
2023		10,077		59,375		—			69,452
Beyond 5 Years		27,013		209,846		2,250,000			2,486,859
Unamortized debt premium/(discount) and issuance costs		—		4,890		(28,517	)		(23,627	)
Total	$	76,698		395,284		3,206,483			3,678,465

⁽¹⁾ Includes unsecured public and private debt and unsecured credit facilities.

⁽²⁾ Reflects scheduled principal payments for the remainder of the year.

The Company was in compliance as of June 30, 2019 with the financial and other covenants under its unsecured public and private placement debt and unsecured credit facilities.

Derivatives

6 Months Ended

Jun. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

6.	Derivative Financial Instruments

The Company may use derivative financial instruments, including interest rate swaps, caps, options, floors, and other interest rate derivative contracts, to hedge all or a portion of the interest rate risk associated with its borrowings. The principal objective of such arrangements is to minimize the risks and/or costs associated with the Company’s operating and financial structure as well as to hedge specific anticipated transactions. The Company does not intend to utilize derivatives for speculative or other purposes other than interest rate risk management. The use of derivative financial instruments carries certain risks, including the risk that the counterparties to these contractual arrangements are not able to perform under the agreements. To mitigate this risk, the Company only enters into derivative financial instruments with counterparties with high credit ratings and with major financial institutions with which the Company and its affiliates may also have other financial relationships. The Company does not anticipate that any of the counterparties will fail to meet their obligations.

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The following table summarizes the terms and fair values of the Company's derivative financial instruments, as well as their classification on the Consolidated Balance Sheets:

							Fair Value
(in thousands)							Assets (Liabilities) ⁽¹⁾
Effective Date	Maturity Date	Notional Amount		Counterparty Pays Variable Rate of	Regency Pays Fixed Rate of		June 30, 2019			December 31, 2018
12/6/18	6/28/19	$	250,000	30 year U.S. Treasury	3.147%	⁽²⁾	$	—			(5,491	)
4/3/17	12/2/20		300,000	1 Month LIBOR with Floor	1.824%			(240	)		3,759
8/1/16	1/5/22		265,000	1 Month LIBOR with Floor	1.053%			3,975			10,838
4/7/16	4/1/23		19,942	1 Month LIBOR	1.303%			217			880
12/1/16	11/1/23		33,000	1 Month LIBOR	1.490%			175			1,376
6/2/17	6/2/27		37,452	1 Month LIBOR with Floor	2.366%			(1,379	)		629
							$	2,748			11,991

⁽¹⁾ Derivatives in an asset position are included within Other assets in the accompanying Consolidated Balance Sheets, while those in a liability position are included within Accounts payable and other liabilities.

⁽²⁾ On March 7, 2019, the Company settled its 30 year Treasury rate lock in connection with its issuance of the $300 million 4.65% unsecured notes due March 2049 for $5.7 million, which is included in the balance of AOCI and will be reclassified to earnings over the 30 year term of the hedged transaction.

These derivative financial instruments are all interest rate swaps, which are designated and qualify as cash flow hedges. The Company does not use derivatives for trading or speculative purposes and, as of June 30, 2019, does not have any derivatives that are not designated as hedges. The Company has master netting agreements; however, the Company does not have multiple derivatives subject to a single master netting agreement with the same counterparties. Therefore, none are offset in the accompanying Consolidated Balance Sheets.

The changes in the fair value of derivatives designated and qualifying as cash flow hedges is recorded in accumulated other comprehensive income (loss) ("AOCI") and subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings.

The following table represents the effect of the derivative financial instruments on the accompanying consolidated financial statements:

Location and Amount of Gain (Loss) Recognized in OCI on Derivative						Location and Amount of Gain (Loss) Reclassified from AOCI into Income					Total amounts presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded
	Three months ended June 30,						Three months ended June 30,					Three months ended June 30,
(in thousands)	2019			2018			2019		2018			2019		2018
Interest rate swaps	$	(9,227	)		4,289	Interest expense	$	584		1,415	Interest expense, net	$	37,173		38,074

Location and Amount of Gain (Loss) Recognized in OCI on Derivative						Location and Amount of Gain (Loss) Reclassified from AOCI into Income					Total amounts presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded
	Six months ended June 30,						Six months ended June 30,					Six months ended June 30,
(in thousands)	2019			2018			2019		2018			2019		2018
Interest rate swaps	$	(14,716	)		13,794	Interest expense	$	408		3,553	Interest expense, net	$	74,925		74,859

As of June 30, 2019, the Company expects approximately $5.3 million of net deferred losses on derivative instruments in AOCI, including the Company's share from its Investments in real estate partnerships, to be reclassified into earnings during the next 12 months. Included in the reclassification is $6.5 million related to previously settled swaps on the Company's ten and thirty year fixed rate unsecured debt.

Leases

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Lessor, Operating Leases [Text Block]

Leases

Lessor Accounting

The Company's Lease income is comprised of both fixed and variable income, as follows:

Fixed and in-substance fixed lease income includes stated amounts per the lease contract, which are primarily related to base rent, and in some cases stated amounts for CAM, real estate taxes, and insurance. Income for these amounts is recognized on a straight line basis.

Variable lease income includes the following two main items in the lease contracts:

Recoveries from tenants represents amounts which tenants are contractually obligated to reimburse the Company for the tenants’ portion of actual Recoverable Costs incurred. Generally the Company’s leases provide for the tenants to reimburse the Company based on the tenants’ share of the actual costs incurred in proportion to the tenants’ share of leased space in the property.

Percentage rent represents amounts billable to tenants based on the tenants' actual sales volume in excess of levels specified in the lease contract.

The following table provides a disaggregation of lease income recognized under ASC Topic 842, Leases, as either fixed or variable lease income based on the criteria specified in ASC 842:

	Three months ended June 30, 2019			Six months ended June 30, 2019
Operating lease income
Fixed and in-substance fixed lease income	$	197,413			399,291
Variable lease income		62,610			125,445
Other lease related income, net
Above/below market rent amortization		6,793			20,247
Uncollectible amounts in lease income		(580	)		(1,444	)
Total lease income	$	266,236			543,539

Future minimum rents under non-cancelable operating leases, excluding variable lease payments, are as follows:

	Future Minimum Rents as of (in thousands)
Year Ending December 31,	June 30, 2019			December 31, 2018
2019	$	389,051	⁽¹⁾		761,151
2020		735,879			693,848
2021		653,515			608,587
2022		561,918			516,369
2023		460,749			414,424
Thereafter		1,841,436			1,691,203
Total	$	4,642,548			4,685,582

⁽¹⁾ The future minimum rental income for 2019 as of June 30, 2019 includes amounts due between July 1, 2019 and December 31, 2019.

Lessee Accounting

The Company has shopping centers that are subject to non-cancelable, long-term ground leases where a third party owns the underlying land and has leased the land to the Company to construct and/or operate a shopping center.

The Company has 22 properties within its consolidated real estate portfolio that are either partially or completely on land subject to ground leases with third parties. Accordingly, the Company owns only a long-term leasehold or similar interest in these properties. These ground leases expire through the year 2101, and in most cases, provide for renewal options.

In addition, the Company has non-cancelable operating leases pertaining to office space from which it conducts its business. Office leases expire through the year 2029, and in many cases, provide for renewal options.

The ground and office lease expense is recognized on a straight line basis over the term of the leases, including management's estimate of expected option renewal periods. Operating lease expense under the Company's ground and office leases was as follows, including straight line rent expense and variable lease expenses such as CPI increases, percentage rent and reimbursements of landlord costs:

	Three months ended June 30, 2019		Six months ended June 30, 2019
Operating lease expense
Ground leases	$	3,528		7,200
Office leases		1,064		2,106
Total fixed operating lease expense		4,592		9,306
Variable lease expense
Ground leases		444		873
Office leases		131		274
Total variable lease expense		575		1,147
Total Lease Expense	$	5,167		10,453
Cash paid for amounts included in the measurement of operating lease liabilities
Operating cash flows from operating leases	$	3,721		7,412

Operating lease expense under the Company's ground and office leases was $5.2 million and $5.0 million during the three months ended June 30, 2019 and 2018, respectively, and $10.5 million and $9.2 million during the six months ended June 30, 2019 and 2018, respectively, which includes fixed and variable rent expense.

The following table summarizes the undiscounted future cash flows by year attributable to the operating lease liabilities under ground and office leases as of June 30, 2019, and provides a reconciliation to the Lease liability included in the accompanying Consolidated Balance Sheets:

	Lease liabilities (in thousands)
Year Ending December 31,	Ground Leases			Office Leases			Total
2019 ⁽¹⁾	$	5,336			2,522			7,858
2020		10,706			4,976			15,682
2021		10,674			3,863			14,537
2022		10,698			2,893			13,591
2023		10,914			2,188			13,102
Thereafter		564,081			5,955			570,036
Total undiscounted lease liabilities	$	612,409			22,397			634,806
Present value discount		(408,464	)		(2,383	)		(410,847	)
Lease liabilities	$	203,945			20,014			223,959
Weighted average discount rate	5.2%			4.0%
Weighted average remaining term	49.6 years			5.7 years

⁽¹⁾ The undiscounted lease liability maturities shown for 2019 are as of June 30, 2019, and includes amounts due between July 1, 2019 and December 31, 2019.

The following table summarizes the future obligations under non-cancelable operating leases, excluding unexercised renewal options, as of December 31, 2018:

	Future Lease Obligations (in thousands)
Year Ending December 31,	Ground Leases		Office Leases		Total Future Lease Obligations
2019	$	10,672		4,405		15,077
2020		10,439		4,294		14,733
2021		10,344		3,549		13,893
2022		10,258		2,893		13,151
2023		10,369		2,189		12,558
Thereafter		461,762		5,944		467,706
Total	$	513,844		23,274		537,118

Fair Value Measurements

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

8.	Fair Value Measurements

(a) Disclosure of Fair Value of Financial Instruments

All financial instruments of the Company are reflected in the accompanying Consolidated Balance Sheets at amounts which, in management's estimation, reasonably approximate their fair values, except for the following:

	June 30, 2019				December 31, 2018
(in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Notes payable	$	2,994,495		3,175,311	$	3,006,478		2,961,769
Unsecured credit facilities	$	683,970		685,705	$	708,734		710,902

The above fair values represent management's estimate of the amounts that would be received from selling those assets or that would be paid to transfer those liabilities in an orderly transaction between market participants as of June 30, 2019 and December 31, 2018, respectively. These fair value measurements maximize the use of observable inputs. However, in situations where there is little, if any, market activity for the asset or liability at the measurement date, the fair value measurement reflects the Company's own judgments about the assumptions that market participants would use in pricing the asset or liability.

The Company develops its judgments based on the best information available at the measurement date, including expected cash flows, appropriate risk-adjusted discount rates, and available observable and unobservable inputs. Service providers involved in fair value measurements are evaluated for competency and qualifications on an ongoing basis. As considerable judgment is often necessary to estimate the fair value of these financial instruments, the fair values presented above are not necessarily indicative of amounts that will be realized upon disposition of the financial instruments.

(b) Fair Value Measurements

The following financial instruments are measured at fair value on a recurring basis:

Securities

The Company has investments in marketable securities that are included within Other assets on the accompanying Consolidated Balance Sheets. The fair value of the securities was determined using quoted prices in active markets, which are considered Level 1 inputs of the fair value hierarchy. Changes in the value of securities are recorded within Net investment income in the accompanying Consolidated Statements of Operations, and include unrealized gains of $525,000 and $291,000, during the three months ended June 30, 2019 and 2018, respectively, and unrealized gains of $2.7 million and unrealized losses of $93,000 for the six months ended June 30, 2019 and 2018, respectively.

Available-for-Sale Debt Securities

Available-for-sale debt securities consist of investments in certificates of deposit and corporate bonds, and are recorded at fair value using matrix pricing methods to estimate fair value, which are considered Level 2 inputs of the fair value hierarchy. Unrealized gains or losses on these debt securities are recognized through other comprehensive income.

Interest Rate Derivatives

The fair value of the Company's interest rate derivatives is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty's nonperformance risk in the fair value measurements.

Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads, to evaluate the likelihood of default by the Company and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its interest rate swaps. As a result, the Company determined that its interest rate swaps valuation in its entirety is classified in Level 2 of the fair value hierarchy.

The following tables present the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis:

	Fair Value Measurements as of June 30, 2019
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
(in thousands)	Balance			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities	$	37,093			37,093		—			—
Available-for-sale debt securities		8,151			—		8,151			—
Interest rate derivatives		4,367			—		4,367			—
Total	$	49,611			37,093		12,518			—
Liabilities:
Interest rate derivatives	$	(1,619	)		—		(1,619	)		—

	Fair Value Measurements as of December 31, 2018
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
(in thousands)	Balance			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities	$	33,354			33,354		—			—
Available-for-sale debt securities		7,933			—		7,933			—
Interest rate derivatives		17,482			—		17,482			—
Total	$	58,769			33,354		25,415			—
Liabilities:
Interest rate derivatives	$	(5,491	)		—		(5,491	)		—

The following tables present the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a non-recurring basis:

	Fair Value Measurements as of June 30, 2019
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Total Gains
(in thousands)	Balance		(Level 1)		(Level 2)		(Level 3)		(Losses)
Operating properties	$	41,976		—		41,976		—	$	(10,447	)

	Fair Value Measurements as of December 31, 2018
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Total Gains
(in thousands)	Balance		(Level 1)		(Level 2)		(Level 3)		(Losses)
Operating properties	$	42,760		—		42,760		—	$	(6,579	)

During six months ended June 30, 2019, the Company impaired two properties, one of which is classified as held and used while the other is classified as held for sale, based on the expected selling prices.

During the year-ended December 31, 2018, the Company impaired three properties, classified as held for sale, based on the expected selling prices. Two of these three properties have been sold and the third continues to be classified as held for sale in the accompanying Consolidated Balance Sheets.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Equity and Capital

6 Months Ended

Jun. 30, 2019

Equity And Capital [Abstract]

Equity and Capital

9.	Equity and Capital

Common Stock of the Parent Company

At the Market ("ATM") Program

Under the Parent Company's ATM equity offering program, the Parent Company may sell up to $500 million of common stock at prices determined by the market at the time of sale. There were no shares issued under the ATM equity program during the six months ended June 30, 2019 and 2018. As of June 30, 2019, all $500 million of common stock remained available for issuance under this ATM equity program.

Share Repurchase Program

On February 5, 2019, the Company's Board authorized a common share repurchase program under which the Company may purchase, from time to time, up to a maximum of $250 million of shares of its outstanding common stock through open market purchases and/or in privately negotiated transactions. Any shares purchased will be retired. The program is set to expire on February 4, 2020. The timing and actual number of shares purchased under the program depend upon marketplace conditions and other factors. The program remains subject to the discretion of the Board. Through June 30, 2019, no shares have been repurchased under this new program.

The Company settled, in January 2019, 563,229 shares, which were repurchased in December 2018 under a previously active repurchase program, for $32.8 million at an average price of $58.17 per share. The program closed in February 2019.

Common Units of the Operating Partnership

Common units of the operating partnership are issued or redeemed and retired for each of the shares of Parent Company common stock issued or repurchased and retired, as described above.

Accumulated Other Comprehensive Income (Loss) ("AOCI")

The following tables present changes in the balances of each component of AOCI:

	Controlling Interests									Noncontrolling Interests			Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Debt Securities			AOCI			Cash Flow Hedges			AOCI
Balance as of December 31, 2018	$	(805	)		(122	)		(927	)		189			(738	)
Other comprehensive loss before reclassifications		(13,874	)		260			(13,614	)		(842	)		(14,456	)
Amounts reclassified from AOCI ⁽¹⁾		455			—			455			(47	)		408
Current period other comprehensive loss, net		(13,419	)		260			(13,159	)		(889	)		(14,048	)
Balance as of June 30, 2019	$	(14,224	)		138			(14,086	)		(700	)		(14,786	)

⁽¹⁾ Amounts reclassified from AOCI into income are presented within Interest expense, net in the Consolidated Statements of Operations.

	Controlling Interests									Noncontrolling Interests			Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Debt Securities			AOCI			Cash Flow Hedges			AOCI
Balance as of December 31, 2017	$	(6,262	)		(27	)		(6,289	)		(112	)		(6,401	)
Opening adjustment due to change in accounting policy ⁽²⁾		12			—			12			2			14
Adjusted balance as of January 1, 2018		(6,250	)		(27	)		(6,277	)		(110	)		(6,387	)
Other comprehensive income before reclassifications		13,156			(75	)		13,081			638			13,719
Amounts reclassified from AOCI ⁽¹⁾		3,513			—			3,513			40			3,553
Current period other comprehensive income, net		16,669			(75	)		16,594			678			17,272
Balance as of June 30, 2018	$	10,419			(102	)		10,317			568			10,885

⁽¹⁾ Amounts reclassified from AOCI into income are presented within Interest expense, net in the Consolidated Statement of Operations.

⁽²⁾ Upon adoption of ASU 2017-12, the Company recognized the immaterial adjustment to opening retained earnings and AOCI for previously recognized hedge ineffectiveness from off-market hedges, as further discussed in note 1.

Non-Qualified Deferred Compensation Plan

6 Months Ended

Jun. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Non-Qualified Deferred Compensation Plan

11.	Non-Qualified Deferred Compensation Plan ("NQDCP")

The Company maintains a NQDCP which allows select employees and directors to defer part or all of their cash bonus, director fees, and vested restricted stock awards. All contributions into the participants' accounts are fully vested upon contribution to the NQDCP and are deposited in a Rabbi trust.

The following table reflects the balances of the assets and deferred compensation liabilities of the Rabbi trust and related participant account obligations in the accompanying Consolidated Balance Sheets, excluding Regency stock:

(in thousands)	June 30, 2019		December 31, 2018		Location in Consolidated Balance Sheets
Assets:
Securities	$	35,189		31,351	Other assets
Liabilities:
Deferred compensation obligation	$	35,049		31,166	Accounts payable and other liabilities

Earnings per Share and Unit

6 Months Ended

Jun. 30, 2019

Earnings Per Share And Unit [Abstract]

Earnings per Share and Unit

12.	Earnings per Share and Unit

Parent Company Earnings per Share

The following summarizes the calculation of basic and diluted earnings per share:

	Three months ended June 30,				Six months ended June 30,
(in thousands, except per share data)	2019		2018		2019		2018
Numerator:
Income from operations attributable to common stockholders - basic	$	51,728		47,841	$	142,174		100,500
Income from operations attributable to common stockholders - diluted	$	51,728		47,841	$	142,174		100,500
Denominator:
Weighted average common shares outstanding for basic EPS		167,536		169,424		167,488		170,056
Weighted average common shares outstanding for diluted EPS ⁽¹⁾		167,962		169,682		167,877		170,291
Income per common share – basic	$	0.31		0.28	$	0.85		0.59
Income per common share – diluted	$	0.31		0.28	$	0.85		0.59

⁽¹⁾ Includes the dilutive impact of unvested restricted stock using the treasury stock method.

Income allocated to noncontrolling interests of the Operating Partnership has been excluded from the numerator and exchangeable Operating Partnership units have been omitted from the denominator for the purpose of computing diluted earnings per share since the effect of including these amounts in the numerator and denominator would be anti-dilutive. Weighted average exchangeable Operating Partnership units outstanding for both the three and six months ended June 30, 2019 and 2018 were 349,902 for both periods.

Operating Partnership Earnings per Unit

The following summarizes the calculation of basic and diluted earnings per unit:

	Three months ended June 30,				Six months ended June 30,
(in thousands, except per share data)	2019		2018		2019		2018
Numerator:
Income from operations attributable to common unit holders - basic	$	51,837		47,941	$	142,473		100,712
Income from operations attributable to common unit holders - diluted	$	51,837		47,941	$	142,473		100,712
Denominator:
Weighted average common units outstanding for basic EPU		167,886		169,774		167,838		170,406
Weighted average common units outstanding for diluted EPU ⁽¹⁾		168,312		170,032		168,227		170,641
Income per common unit – basic	$	0.31		0.28	$	0.85		0.59
Income per common unit – diluted	$	0.31		0.28	$	0.85		0.59

⁽¹⁾ Includes the dilutive impact of unvested restricted stock using the treasury stock method.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

13.	Commitments and Contingencies

Litigation

The Company is involved in litigation on a number of matters and is subject to certain claims, which arise in the normal course of business, none of which, in the opinion of management, is expected to have a material adverse effect on the Company's consolidated financial position, results of operations, or liquidity. Legal fees are expensed as incurred.

Environmental

The Company is also subject to numerous environmental laws and regulations as they apply to real estate pertaining to chemicals used by the dry cleaning industry, the existence of asbestos in older shopping centers, and underground petroleum storage tanks. The Company believes that the ultimate disposition of currently known environmental matters will not have a material effect on its financial position, liquidity, or operations. The Company can give no assurance that existing environmental studies with respect to the shopping centers have revealed all potential environmental contaminants or liabilities, that any previous owner, occupant or tenant did not create any material environmental condition not known to it, that the current environmental condition of the shopping centers will not be affected by tenants and occupants, by the condition of nearby properties, or by unrelated third parties, or that changes in applicable environmental laws and regulations or their interpretation will not result in additional environmental liability to the Company.

Letters of Credit

The Company has the right to issue letters of credit under the Line up to an amount not to exceed $50.0 million, which reduces the credit availability under the Line. These letters of credit are primarily issued as collateral on behalf of its captive insurance program and to facilitate the construction of development projects. As of June 30, 2019 and December 31, 2018, the Company had $12.6 million and $9.4 million, respectively in letters of credit outstanding.

Purchase Commitments

The Company enters into purchase and sale agreements to buy or sell real estate assets in the normal course of business, which generally provide limited recourse if either party ends the contract. At June 30, 2019, the Company has an agreement related to its Town and Country Center in Los Angeles, CA (“the Center”) that provides an option for the seller to require the Company to purchase up to an additional 81.63% ownership interest in the center by December 2019. The Company currently expects to be required to purchase an additional 16.63% interest by that date for approximately $17.1 million.

Organization and Principles of Consolidation (Policies)

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Consolidation, Variable Interest Entity, Policy

Real Estate Partnerships

The major classes of assets, liabilities, and non-controlling equity interests held by the Company's consolidated VIEs, exclusive of the Operating Partnership, are as follows:

(in thousands)	June 30, 2019		December 31, 2018
Assets
Net real estate investments	$	116,894		112,085
Cash, cash equivalents and restricted cash		4,022		7,309
Liabilities
Notes payable		17,657		18,432
Equity
Limited partners’ interests in consolidated partnerships		31,058		30,280

Revenue Recognition, Services, Management Fees

Revenues and Other Receivables

		Three months ended June 30,				Six months ended June 30,
(in thousands)	Timing of satisfaction of performance obligations	2019		2018		2019		2018
Other property income	Point in time	$	2,194		2,322	$	4,176		4,347
Management, transaction and other fees
Property management services	Over time		3,665		3,652		7,428		7,420
Asset management services	Over time		1,760		1,804		3,538		3,507
Leasing services	Point in time		705		1,072		1,463		1,757
Other transaction fees	Point in time		1,312		359		1,986		1,361
Total management, transaction, and other fees		$	7,442		6,887	$	14,415		14,045

New Accounting Pronouncements and Changes in Accounting Principles

Recent Accounting Pronouncements

The following table provides a brief description of recent accounting pronouncements and expected impact on our financial statements:




Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Recently adopted:

Leases (Topic 842) and related updates: ASU 2016-02, February 2016, Leases (Topic 842) ASU 2018-10, July 2018: Codification Improvements to Topic 842, Leases ASU 2018-11, July 2018, Leases (Topic 842): Targeted Improvements ASU 2018-20, December 2018, Leases (Topic 842) : Narrow-Scope Improvements for Lessors ASU 2019-01, March 2019, Leases (Topic 842) : Codification Improvements	Topic 842 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. It also makes targeted changes to lessor accounting. The provisions of these ASUs are effective as of January 1, 2019, with early adoption permitted. Topic 842 provides a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief or an additional transition method, allowing for initial application at the date of adoption and a cumulative-effect adjustment to opening retained earnings. See the updated Leases accounting policy disclosed earlier in Note 1 and the added Leases disclosures in Note 7.	January 2019	The Company has completed its evaluation and adoption of this standard, as discussed earlier in Note 1. The Company utilized the alternative modified retrospective transition method provided in ASU 2018-11 (the "effective date method"), under which the effective date of January 1, 2019 is also the date of initial application. See the updated Leases accounting policy disclosed earlier in Note 1 and the added disclosures in Note 7, Leases. Beyond the policy, presentation and disclosure changes discussed, the following changes had a direct impact to Net Income from the adoption of Topic 842: Capitalization of indirect internal non-contingent leasing costs and legal leasing costs are no longer permitted upon the adoption of this standard, which is resulting in an increase to Total operating expenses in the Consolidated Statements of Operations. Previous capitalization of internal leasing costs was $6.5 million during the year ended December 31, 2018. Previous capitalization of legal costs was $1.6 million during the year ended December 31, 2018, including our pro rata share recognized through Equity in income of investments in real estate partnerships.




Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Not yet adopted:

ASU 2016-13, June 2016, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	This ASU replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This ASU also applies to how the Company evaluates impairments of any held to maturity debt securities.	January 2020	The Company is currently evaluating the accounting standard, but does not expect the adoption to have a material impact on its financial position, results of operations, or cash flows.

ASU 2018-19, November 2018: Codification Improvements to Topic 326, Financial Instruments - Credit Losses	This ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases.	January 2020	The Company currently does not expect the adoption of this ASU to have a material impact on its financial statements and related disclosures. See Leases section of Note 1 for disclosure of collectibility policy over lease receivables from operating leases.

ASU 2018-13, August 2018, Fair Value Measurements (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	This ASU modifies the disclosure requirements for fair value measurements within the scope of Topic 820, Fair Value Measurements, including the removal and modification of certain existing disclosures, and the addition of new disclosures.	January 2020	The Company is currently evaluating the impact of adopting this new accounting standard, which is expected to only impact fair value measurement disclosures and therefore should have no impact on the Company's financial position, results of operations, or cash flows.

ASU 2018-15, August 2018, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.	The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The ASU provides further clarification of the appropriate presentation of capitalized costs, the period over which to recognize the expense, the presentation within the Statements of Operations and Statements of Cash Flows, and the disclosure requirements. Early adoption of the standard is permitted.	January 2020	The Company is currently evaluating the accounting standard, but does not expect the adoption to have a material impact on its financial position, results of operations, or cash flows.

Organization and Principles of Consolidation Recent Accounting Pronouncements (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Changes And Error Corrections [Abstract]

Schedule of Variable Interest Entities

The major classes of assets, liabilities, and non-controlling equity interests held by the Company's consolidated VIEs, exclusive of the Operating Partnership, are as follows:

(in thousands)	June 30, 2019		December 31, 2018
Assets
Net real estate investments	$	116,894		112,085
Cash, cash equivalents and restricted cash		4,022		7,309
Liabilities
Notes payable		17,657		18,432
Equity
Limited partners’ interests in consolidated partnerships		31,058		30,280

Revenues and Other Receivables

		Three months ended June 30,				Six months ended June 30,
(in thousands)	Timing of satisfaction of performance obligations	2019		2018		2019		2018
Other property income	Point in time	$	2,194		2,322	$	4,176		4,347
Management, transaction and other fees
Property management services	Over time		3,665		3,652		7,428		7,420
Asset management services	Over time		1,760		1,804		3,538		3,507
Leasing services	Point in time		705		1,072		1,463		1,757
Other transaction fees	Point in time		1,312		359		1,986		1,361
Total management, transaction, and other fees		$	7,442		6,887	$	14,415		14,045

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The following table provides a brief description of recent accounting pronouncements and expected impact on our financial statements:




Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Recently adopted:

Leases (Topic 842) and related updates: ASU 2016-02, February 2016, Leases (Topic 842) ASU 2018-10, July 2018: Codification Improvements to Topic 842, Leases ASU 2018-11, July 2018, Leases (Topic 842): Targeted Improvements ASU 2018-20, December 2018, Leases (Topic 842) : Narrow-Scope Improvements for Lessors ASU 2019-01, March 2019, Leases (Topic 842) : Codification Improvements	Topic 842 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. It also makes targeted changes to lessor accounting. The provisions of these ASUs are effective as of January 1, 2019, with early adoption permitted. Topic 842 provides a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief or an additional transition method, allowing for initial application at the date of adoption and a cumulative-effect adjustment to opening retained earnings. See the updated Leases accounting policy disclosed earlier in Note 1 and the added Leases disclosures in Note 7.	January 2019	The Company has completed its evaluation and adoption of this standard, as discussed earlier in Note 1. The Company utilized the alternative modified retrospective transition method provided in ASU 2018-11 (the "effective date method"), under which the effective date of January 1, 2019 is also the date of initial application. See the updated Leases accounting policy disclosed earlier in Note 1 and the added disclosures in Note 7, Leases. Beyond the policy, presentation and disclosure changes discussed, the following changes had a direct impact to Net Income from the adoption of Topic 842: Capitalization of indirect internal non-contingent leasing costs and legal leasing costs are no longer permitted upon the adoption of this standard, which is resulting in an increase to Total operating expenses in the Consolidated Statements of Operations. Previous capitalization of internal leasing costs was $6.5 million during the year ended December 31, 2018. Previous capitalization of legal costs was $1.6 million during the year ended December 31, 2018, including our pro rata share recognized through Equity in income of investments in real estate partnerships.




Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Not yet adopted:

ASU 2016-13, June 2016, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	This ASU replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This ASU also applies to how the Company evaluates impairments of any held to maturity debt securities.	January 2020	The Company is currently evaluating the accounting standard, but does not expect the adoption to have a material impact on its financial position, results of operations, or cash flows.

ASU 2018-19, November 2018: Codification Improvements to Topic 326, Financial Instruments - Credit Losses	This ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Instead, impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases.	January 2020	The Company currently does not expect the adoption of this ASU to have a material impact on its financial statements and related disclosures. See Leases section of Note 1 for disclosure of collectibility policy over lease receivables from operating leases.

ASU 2018-13, August 2018, Fair Value Measurements (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement	This ASU modifies the disclosure requirements for fair value measurements within the scope of Topic 820, Fair Value Measurements, including the removal and modification of certain existing disclosures, and the addition of new disclosures.	January 2020	The Company is currently evaluating the impact of adopting this new accounting standard, which is expected to only impact fair value measurement disclosures and therefore should have no impact on the Company's financial position, results of operations, or cash flows.

ASU 2018-15, August 2018, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.	The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The ASU provides further clarification of the appropriate presentation of capitalized costs, the period over which to recognize the expense, the presentation within the Statements of Operations and Statements of Cash Flows, and the disclosure requirements. Early adoption of the standard is permitted.	January 2020	The Company is currently evaluating the accounting standard, but does not expect the adoption to have a material impact on its financial position, results of operations, or cash flows.

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Real Estate Investments (Tables)

6 Months Ended

Jun. 30, 2019

Real Estate [Abstract]

Schedule of business acquisitions

The following tables detail the shopping centers acquired or land acquired or leased for development or redevelopment:

(in thousands)		Six months ended June 30, 2019
Date Purchased	Property Name	City/State	Property Type	Ownership	Purchase Price		Debt Assumed, Net of Premiums		Intangible Assets		Intangible Liabilities
1/8/19	Pablo Plaza ⁽¹⁾	Jacksonville, FL	Operating	100%	$	600		—		—		—
2/8/19	Melrose Market	Seattle, WA	Operating	100%		15,515		—		941		358
6/18/19	The Field at Commonwealth Ph II ⁽²⁾	Chantilly, VA	Development	100%		4,083		—		—		—
6/21/19	Culver Public Market	Culver City, CA	Development	100%		1,279		—		—		—
6/28/19	6401 Roosevelt	Seattle, WA	Operating	100%		3,550		—		—		—
Total property acquisitions					$	25,027		—		941		358

⁽¹⁾ The Company purchased a .17 acre land parcel adjacent to the Company's existing operating Pablo Plaza for redevelopment.

⁽²⁾ The Company purchased The Field at Commonwealth Ph II, which is land adjacent to an existing operating property, for future development.

(in thousands)		Six months ended June 30, 2018
Date Purchased	Property Name	City/State	Property Type	Ownership	Purchase Price		Debt Assumed, Net of Premiums		Intangible Assets		Intangible Liabilities
1/2/18	Ballard Blocks I	Seattle, WA	Operating	49.9%	$	54,500		—		3,668		2,350
1/2/18	Ballard Blocks II	Seattle, WA	Development	49.9%		4,000		—		—		—
1/5/18	Metuchen	Metuchen, NJ	Operating	20%		33,830		—		3,147		1,905
1/10/18	Hewlett Crossing I & II	Hewlett, NY	Operating	100%		30,900		9,700		3,114		1,868
4/3/18	Rivertowns Square	Dobby Ferry, NY	Operating	100%		68,933		—		4,993		5,554
5/18/18	Crossroads Commons II	Boulder, CO	Operating	20%		10,500		—		447		769
Total property acquisitions					$	202,663		9,700		15,369		12,446

Property Dispositions (Tables)

6 Months Ended

Jun. 30, 2019

Discontinued Operations And Disposal Groups [Abstract]

Schedule of Properties Disposed of

The following table provides a summary of consolidated shopping centers and land parcels disposed of during the periods set forth below:

	Three months ended June 30,						Six months ended June 30,
(in thousands, except number sold data)	2019			2018			2019			2018
Net proceeds from sale of real estate investments	$	927			38,781		$	83,460			42,008
Gain on sale of real estate, net of tax		442			1,123			16,932			1,219
Provision for impairment of real estate sold		(6	)		2,974			1,666			3,348
Number of operating properties sold		-			3			4			4
Number of land parcels sold		1			3			3			3
Percent interest sold		100	%		100	%		100	%		100	%

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

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+ Details

Other Assets Other Assets (Tables)

6 Months Ended

Jun. 30, 2019

Other Assets [Abstract]

Schedule of Other Assets [Table Text Block]

The following table represents the components of Other assets in the accompanying Consolidated Balance Sheets:

(in thousands)	June 30, 2019		December 31, 2018
Goodwill, net	$	313,180		314,143
Investments		45,244		41,287
Prepaid and other		35,595		17,937
Derivative assets		4,367		17,482
Furniture, fixtures, and equipment, net		6,590		6,127
Deferred financing costs, net		5,769		6,851
Total other assets	$	410,745		403,827

Schedule of Goodwill [Table Text Block]

The following table presents the goodwill balances and activity during the year to date periods ended:

	June 30, 2019									December 31, 2018
(in thousands)	Goodwill			Accumulated Impairment Losses			Total			Goodwill			Accumulated Impairment Losses			Total
Beginning of year balance	$	316,858			(2,715	)		314,143		$	331,884			—			331,884
Goodwill additions		—			—			—			500			—			500
Goodwill allocated to Provision for impairment		—			(963	)		(963	)		—			(12,628	)		(12,628	)
Goodwill allocated to Properties held for sale		—			—			—			(1,159	)		—			(1,159	)
Goodwill associated with disposed reporting units:
Goodwill allocated to Provision for impairment		(1,779	)		1,779			—			(9,913	)		9,913			—
Goodwill allocated to Gain on sale of real estate		(527	)		527			—			(4,454	)		—			(4,454	)
End of period balance	$	314,552			(1,372	)		313,180		$	316,858			(2,715	)		314,143

Notes Payable and Unsecured Credit Facilities (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Debt

The Company’s outstanding debt consisted of the following:

(in thousands)	Weighted Average Contractual Rate	Weighted Average Effective Rate	June 30, 2019		December 31, 2018
Notes payable:
Fixed rate mortgage loans	4.5%	4.0%	$	344,963		403,306
Variable rate mortgage loans ⁽¹⁾	3.5%	3.6%		127,018		127,850
Fixed rate unsecured public and private debt	4.0%	4.4%		2,522,514		2,475,322
Total notes payable				2,994,495		3,006,478
Unsecured credit facilities:
Line of Credit (the "Line") ⁽²⁾	3.4%	3.6%		120,000		145,000
Term loans	2.4%	2.5%		563,970		563,734
Total unsecured credit facilities				683,970		708,734
Total debt outstanding			$	3,678,465		3,715,212

⁽²⁾ Weighted average effective and contractual rate for the Line is calculated based on a fully drawn Line balance.

Schedule of maturities of long-term debt

As of June 30, 2019, scheduled principal payments and maturities on notes payable and unsecured credit facilities were as follows:

(in thousands)	June 30, 2019
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities		Unsecured Maturities ⁽¹⁾			Total
2019 ⁽²⁾	$	4,924		—		—			4,924
2020		11,287		39,074		300,000			350,361
2021		11,599		76,251		—			87,850
2022		11,798		5,848		685,000			702,646
2023		10,077		59,375		—			69,452
Beyond 5 Years		27,013		209,846		2,250,000			2,486,859
Unamortized debt premium/(discount) and issuance costs		—		4,890		(28,517	)		(23,627	)
Total	$	76,698		395,284		3,206,483			3,678,465

⁽¹⁾ Includes unsecured public and private debt and unsecured credit facilities.

⁽²⁾ Reflects scheduled principal payments for the remainder of the year.

Derivatives (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of derivative instruments

The following table summarizes the terms and fair values of the Company's derivative financial instruments, as well as their classification on the Consolidated Balance Sheets:

							Fair Value
(in thousands)							Assets (Liabilities) ⁽¹⁾
Effective Date	Maturity Date	Notional Amount		Counterparty Pays Variable Rate of	Regency Pays Fixed Rate of		June 30, 2019			December 31, 2018
12/6/18	6/28/19	$	250,000	30 year U.S. Treasury	3.147%	⁽²⁾	$	—			(5,491	)
4/3/17	12/2/20		300,000	1 Month LIBOR with Floor	1.824%			(240	)		3,759
8/1/16	1/5/22		265,000	1 Month LIBOR with Floor	1.053%			3,975			10,838
4/7/16	4/1/23		19,942	1 Month LIBOR	1.303%			217			880
12/1/16	11/1/23		33,000	1 Month LIBOR	1.490%			175			1,376
6/2/17	6/2/27		37,452	1 Month LIBOR with Floor	2.366%			(1,379	)		629
							$	2,748			11,991

Derivative Instruments, Gain (Loss)

The following table represents the effect of the derivative financial instruments on the accompanying consolidated financial statements:

Location and Amount of Gain (Loss) Recognized in OCI on Derivative						Location and Amount of Gain (Loss) Reclassified from AOCI into Income					Total amounts presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded
	Three months ended June 30,						Three months ended June 30,					Three months ended June 30,
(in thousands)	2019			2018			2019		2018			2019		2018
Interest rate swaps	$	(9,227	)		4,289	Interest expense	$	584		1,415	Interest expense, net	$	37,173		38,074

Location and Amount of Gain (Loss) Recognized in OCI on Derivative						Location and Amount of Gain (Loss) Reclassified from AOCI into Income					Total amounts presented in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded
	Six months ended June 30,						Six months ended June 30,					Six months ended June 30,
(in thousands)	2019			2018			2019		2018			2019		2018
Interest rate swaps	$	(14,716	)		13,794	Interest expense	$	408		3,553	Interest expense, net	$	74,925		74,859

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Operating Lease, Lease Income [Table Text Block]

The following table provides a disaggregation of lease income recognized under ASC Topic 842, Leases, as either fixed or variable lease income based on the criteria specified in ASC 842:

	Three months ended June 30, 2019			Six months ended June 30, 2019
Operating lease income
Fixed and in-substance fixed lease income	$	197,413			399,291
Variable lease income		62,610			125,445
Other lease related income, net
Above/below market rent amortization		6,793			20,247
Uncollectible amounts in lease income		(580	)		(1,444	)
Total lease income	$	266,236			543,539

Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block]

Future minimum rents under non-cancelable operating leases, excluding variable lease payments, are as follows:

	Future Minimum Rents as of (in thousands)
Year Ending December 31,	June 30, 2019			December 31, 2018
2019	$	389,051	⁽¹⁾		761,151
2020		735,879			693,848
2021		653,515			608,587
2022		561,918			516,369
2023		460,749			414,424
Thereafter		1,841,436			1,691,203
Total	$	4,642,548			4,685,582

⁽¹⁾ The future minimum rental income for 2019 as of June 30, 2019 includes amounts due between July 1, 2019 and December 31, 2019.

Lessee, Operating Lease Costs, Description

Operating lease expense under the Company's ground and office leases was as follows, including straight line rent expense and variable lease expenses such as CPI increases, percentage rent and reimbursements of landlord costs:

	Three months ended June 30, 2019		Six months ended June 30, 2019
Operating lease expense
Ground leases	$	3,528		7,200
Office leases		1,064		2,106
Total fixed operating lease expense		4,592		9,306
Variable lease expense
Ground leases		444		873
Office leases		131		274
Total variable lease expense		575		1,147
Total Lease Expense	$	5,167		10,453
Cash paid for amounts included in the measurement of operating lease liabilities
Operating cash flows from operating leases	$	3,721		7,412

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

	Lease liabilities (in thousands)
Year Ending December 31,	Ground Leases			Office Leases			Total
2019 ⁽¹⁾	$	5,336			2,522			7,858
2020		10,706			4,976			15,682
2021		10,674			3,863			14,537
2022		10,698			2,893			13,591
2023		10,914			2,188			13,102
Thereafter		564,081			5,955			570,036
Total undiscounted lease liabilities	$	612,409			22,397			634,806
Present value discount		(408,464	)		(2,383	)		(410,847	)
Lease liabilities	$	203,945			20,014			223,959
Weighted average discount rate	5.2%			4.0%
Weighted average remaining term	49.6 years			5.7 years

⁽¹⁾ The undiscounted lease liability maturities shown for 2019 are as of June 30, 2019, and includes amounts due between July 1, 2019 and December 31, 2019.

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

The following table summarizes the future obligations under non-cancelable operating leases, excluding unexercised renewal options, as of December 31, 2018:

	Future Lease Obligations (in thousands)
Year Ending December 31,	Ground Leases		Office Leases		Total Future Lease Obligations
2019	$	10,672		4,405		15,077
2020		10,439		4,294		14,733
2021		10,344		3,549		13,893
2022		10,258		2,893		13,151
2023		10,369		2,189		12,558
Thereafter		461,762		5,944		467,706
Total	$	513,844		23,274		537,118

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of balance sheet fair values

	June 30, 2019				December 31, 2018
(in thousands)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Notes payable	$	2,994,495		3,175,311	$	3,006,478		2,961,769
Unsecured credit facilities	$	683,970		685,705	$	708,734		710,902

Summary of assets measured on recurring basis

The following tables present the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis:

	Fair Value Measurements as of June 30, 2019
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
(in thousands)	Balance			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities	$	37,093			37,093		—			—
Available-for-sale debt securities		8,151			—		8,151			—
Interest rate derivatives		4,367			—		4,367			—
Total	$	49,611			37,093		12,518			—
Liabilities:
Interest rate derivatives	$	(1,619	)		—		(1,619	)		—

	Fair Value Measurements as of December 31, 2018
				Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs			Significant Unobservable Inputs
(in thousands)	Balance			(Level 1)		(Level 2)			(Level 3)
Assets:
Securities	$	33,354			33,354		—			—
Available-for-sale debt securities		7,933			—		7,933			—
Interest rate derivatives		17,482			—		17,482			—
Total	$	58,769			33,354		25,415			—
Liabilities:
Interest rate derivatives	$	(5,491	)		—		(5,491	)		—

Summary of assets measured on non-recurring basis

The following tables present the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a non-recurring basis:

	Fair Value Measurements as of June 30, 2019
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Total Gains
(in thousands)	Balance		(Level 1)		(Level 2)		(Level 3)		(Losses)
Operating properties	$	41,976		—		41,976		—	$	(10,447	)

	Fair Value Measurements as of December 31, 2018
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Total Gains
(in thousands)	Balance		(Level 1)		(Level 2)		(Level 3)		(Losses)
Operating properties	$	42,760		—		42,760		—	$	(6,579	)

Equity and Capital (Tables)

6 Months Ended

Jun. 30, 2019

Equity And Capital [Abstract]

Summary of accumulated other comprehensive loss

The following tables present changes in the balances of each component of AOCI:

	Controlling Interests									Noncontrolling Interests			Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Debt Securities			AOCI			Cash Flow Hedges			AOCI
Balance as of December 31, 2018	$	(805	)		(122	)		(927	)		189			(738	)
Other comprehensive loss before reclassifications		(13,874	)		260			(13,614	)		(842	)		(14,456	)
Amounts reclassified from AOCI ⁽¹⁾		455			—			455			(47	)		408
Current period other comprehensive loss, net		(13,419	)		260			(13,159	)		(889	)		(14,048	)
Balance as of June 30, 2019	$	(14,224	)		138			(14,086	)		(700	)		(14,786	)

⁽¹⁾ Amounts reclassified from AOCI into income are presented within Interest expense, net in the Consolidated Statements of Operations.

	Controlling Interests									Noncontrolling Interests			Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Debt Securities			AOCI			Cash Flow Hedges			AOCI
Balance as of December 31, 2017	$	(6,262	)		(27	)		(6,289	)		(112	)		(6,401	)
Opening adjustment due to change in accounting policy ⁽²⁾		12			—			12			2			14
Adjusted balance as of January 1, 2018		(6,250	)		(27	)		(6,277	)		(110	)		(6,387	)
Other comprehensive income before reclassifications		13,156			(75	)		13,081			638			13,719
Amounts reclassified from AOCI ⁽¹⁾		3,513			—			3,513			40			3,553
Current period other comprehensive income, net		16,669			(75	)		16,594			678			17,272
Balance as of June 30, 2018	$	10,419			(102	)		10,317			568			10,885

⁽¹⁾ Amounts reclassified from AOCI into income are presented within Interest expense, net in the Consolidated Statement of Operations.

Non-Qualified Deferred Compensation Plan (Tables)

6 Months Ended

Jun. 30, 2019

Compensation And Retirement Disclosure [Abstract]

Summary of balances of the assets and deferred compensation liabilities of the Rabbi trust and related participant account obligations

(in thousands)	June 30, 2019		December 31, 2018		Location in Consolidated Balance Sheets
Assets:
Securities	$	35,189		31,351	Other assets
Liabilities:
Deferred compensation obligation	$	35,049		31,166	Accounts payable and other liabilities

Earnings per Share and Unit (Tables)

6 Months Ended

Jun. 30, 2019

Schedule of earnings per share

The following summarizes the calculation of basic and diluted earnings per share:

	Three months ended June 30,				Six months ended June 30,
(in thousands, except per share data)	2019		2018		2019		2018
Numerator:
Income from operations attributable to common stockholders - basic	$	51,728		47,841	$	142,174		100,500
Income from operations attributable to common stockholders - diluted	$	51,728		47,841	$	142,174		100,500
Denominator:
Weighted average common shares outstanding for basic EPS		167,536		169,424		167,488		170,056
Weighted average common shares outstanding for diluted EPS ⁽¹⁾		167,962		169,682		167,877		170,291
Income per common share – basic	$	0.31		0.28	$	0.85		0.59
Income per common share – diluted	$	0.31		0.28	$	0.85		0.59

⁽¹⁾ Includes the dilutive impact of unvested restricted stock using the treasury stock method.

Partnership Interest [Member]

Schedule of earnings per share

The following summarizes the calculation of basic and diluted earnings per unit:

	Three months ended June 30,				Six months ended June 30,
(in thousands, except per share data)	2019		2018		2019		2018
Numerator:
Income from operations attributable to common unit holders - basic	$	51,837		47,941	$	142,473		100,712
Income from operations attributable to common unit holders - diluted	$	51,837		47,941	$	142,473		100,712
Denominator:
Weighted average common units outstanding for basic EPU		167,886		169,774		167,838		170,406
Weighted average common units outstanding for diluted EPU ⁽¹⁾		168,312		170,032		168,227		170,641
Income per common unit – basic	$	0.31		0.28	$	0.85		0.59
Income per common unit – diluted	$	0.31		0.28	$	0.85		0.59

⁽¹⁾ Includes the dilutive impact of unvested restricted stock using the treasury stock method.

Organization and Principles of Consolidation (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) retail_shopping_center	Jun. 30, 2018	Jun. 30, 2019 USD ($) retail_shopping_center	Jun. 30, 2018
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Document Period End Date			Jun. 30, 2019
Unsecured public and private notes \| $	$ 500		$ 500
Operating Partnership [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Ownership percentage of outstanding common partnership units			99.80%
Wholly Owned Properties [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of Real Estate Properties	304		304
Ownership percentage of outstanding common partnership units	100.00%	100.00%	100.00%	100.00%
Unconsolidated Properties [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of Real Estate Properties	117		117

Organization and Principles of Consolidation Variable Interest Entities (Details) $ in Thousands	Jun. 30, 2019 USD ($) retail_shopping_center	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 17,657	$ 18,432
Noncontrolling Interest in Variable Interest Entity	31,058	30,280
Real Estate [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	116,894	112,085
Cash and Cash Equivalents [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 4,022	$ 7,309
Partially Owned Properties [Member]
Variable Interest Entity [Line Items]
Number of Real Estate Properties \| retail_shopping_center	129
Consolidated Properties [Member]
Variable Interest Entity [Line Items]
Number of Real Estate Properties \| retail_shopping_center	12

Organization and Principles of Consolidation Revenues and Tenant and Other Receivables (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Schedule of management, transaction, and other fees [Line Items]
Lease liabilities	$ 223,959		$ 223,959		$ 225,400	$ 0
Right of use assets, net	295,084		295,084		$ 297,800	0
Other property income	2,194	$ 2,322	4,176	$ 4,347
Management, transaction, and other fees	7,442	6,887	14,415	14,045
Tenant and other receivables	157,883		157,883			172,359
Management, transaction, and other fee [Member]
Schedule of management, transaction, and other fees [Line Items]
Tenant and other receivables	11,000		11,000			$ 12,500
Property management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	3,665	3,652	7,428	7,420
Asset management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	1,760	1,804	3,538	3,507
Leasing services [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	705	1,072	1,463	1,757
Other transaction fees [Member]
Schedule of management, transaction, and other fees [Line Items]
Management, transaction, and other fees	$ 1,312	$ 359	$ 1,986	$ 1,361
Leases less than 10,000 sqft [Member]
Schedule of management, transaction, and other fees [Line Items]
Operating leases, tenant space terms \| ft²			10,000
Leases greater then 10,000sqft [Member]
Schedule of management, transaction, and other fees [Line Items]
Operating leases, tenant space terms \| ft²			10,000
Minimum [Member]
Schedule of management, transaction, and other fees [Line Items]
Operating leases, lease year range			3 years
Operating leases, lease year range for tenant space greater than 10,000 sq ft			5 years
Maximum [Member]
Schedule of management, transaction, and other fees [Line Items]
Operating leases, lease year range			7 years

Organization and Principles of Consolidation Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 30,903
Accounting Standards Update 2016-02 [Member] \| Salaries expense [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 6,500
Accounting Standards Update 2016-02 [Member] \| Legal expense [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 1,600

Real Estate Investments Business Acquisitions (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Purchase Price	$ 25,027	$ 202,663
Debt Assumed, Net of Premiums	0	9,700
Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets	941	15,369
Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 358	$ 12,446
Pablo Plaza [Member]
Business Acquisition [Line Items]
Date Purchased	Jan. 08, 2019
Property Name	Pablo Plaza (1)
City/State	Jacksonville, FL
Ownership	100.00%
Purchase Price	$ 600
Debt Assumed, Net of Premiums	0
Pablo Plaza [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets	0
Pablo Plaza [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 0
Melrose Market [Member]
Business Acquisition [Line Items]
Date Purchased	Feb. 08, 2019
Property Name	Melrose Market
City/State	Seattle, WA
Ownership	100.00%
Purchase Price	$ 15,515
Debt Assumed, Net of Premiums	0
Melrose Market [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets	941
Melrose Market [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 358
The Field at Commonwealth Ph II [Member]
Business Acquisition [Line Items]
Date Purchased	Jun. 18, 2019
Property Name	The Field at Commonwealth Ph II (2)
City/State	Chantilly, VA
Ownership	100.00%
Purchase Price	$ 4,083
Debt Assumed, Net of Premiums	0
The Field at Commonwealth Ph II [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets	0
The Field at Commonwealth Ph II [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 0
Culver Public Market [Member]
Business Acquisition [Line Items]
Date Purchased	Jun. 21, 2019
Property Name	Culver Public Market
City/State	Culver City, CA
Ownership	100.00%
Purchase Price	$ 1,279
Debt Assumed, Net of Premiums	0
Culver Public Market [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets	0
Culver Public Market [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 0
6401 Roosevelt [Member]
Business Acquisition [Line Items]
Date Purchased	Jun. 28, 2019
Property Name	6401 Roosevelt
City/State	Seattle, WA
Ownership	100.00%
Purchase Price	$ 3,550
Debt Assumed, Net of Premiums	0
6401 Roosevelt [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets	0
6401 Roosevelt [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets	$ 0
Ballard Blocks I [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 02, 2018
Property Name		Ballard Blocks I
City/State		Seattle, WA
Ownership		49.90%
Purchase Price		$ 54,500
Debt Assumed, Net of Premiums		0
Ballard Blocks I [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets		3,668
Ballard Blocks I [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets		$ 2,350
Ballard Blocks II [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 02, 2018
Property Name		Ballard Blocks II
City/State		Seattle, WA
Ownership		49.90%
Purchase Price		$ 4,000
Debt Assumed, Net of Premiums		0
Ballard Blocks II [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets		0
Ballard Blocks II [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets		$ 0
Metuchen [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 05, 2018
Property Name		Metuchen
City/State		Metuchen, NJ
Ownership		20.00%
Purchase Price		$ 33,830
Debt Assumed, Net of Premiums		0
Metuchen [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets		3,147
Metuchen [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets		$ 1,905
Hewlett Crossing I & II [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 10, 2018
Property Name		Hewlett Crossing I & II
City/State		Hewlett, NY
Ownership		100.00%
Purchase Price		$ 30,900
Debt Assumed, Net of Premiums		9,700
Hewlett Crossing I & II [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets		3,114
Hewlett Crossing I & II [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets		$ 1,868
Rivertowns Square [Member]
Business Acquisition [Line Items]
Date Purchased		Apr. 03, 2018
Property Name		Rivertowns Square
City/State		Dobby Ferry, NY
Ownership		100.00%
Purchase Price		$ 68,933
Debt Assumed, Net of Premiums		0
Rivertowns Square [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets		4,993
Rivertowns Square [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets		$ 5,554
Crossroads Commons II [Member]
Business Acquisition [Line Items]
Date Purchased		May 18, 2018
Property Name		Crossroads Commons II
City/State		Boulder, CO
Ownership		20.00%
Purchase Price		$ 10,500
Debt Assumed, Net of Premiums		0
Crossroads Commons II [Member] \| Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible Assets		447
Crossroads Commons II [Member] \| Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible Assets		$ 769

Real Estate Investments Business Acquisitions (Parenthetical) (Details) $ in Thousands		6 Months Ended
	Jul. 01, 2019 USD ($) ft²	Jun. 30, 2019 USD ($) a	Jun. 30, 2018 USD ($)
Business Acquisition [Line Items]
Purchase Price		$ 25,027	$ 202,663
Pablo Plaza [Member]
Business Acquisition [Line Items]
Purchase of land for redevelopment \| a		0.17
Date Purchased		Jan. 08, 2019
Ownership		100.00%
Purchase Price		$ 600
The Pruneyard [Member] \| Subsequent Event
Business Acquisition [Line Items]
Purchase of land for redevelopment \| ft²	258,000
Date Purchased	Jul. 01, 2019
Ownership	100.00%
Purchase Price	$ 212,500

Property Dispositions (Details) $ in Thousands	3 Months Ended		6 Months Ended
Property Dispositions (Details) $ in Thousands	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($) property	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of real estate investments	$ 927	$ 38,781	$ 83,460	$ 42,008
Gain on sale of real estate, net of tax	442	1,123	16,932	1,219
Provision for impairment, net of tax	$ 10,441	$ 12,533	$ 12,113	$ 28,587
Number of properties held for sale \| property	1		1
Wholly Owned Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percent interest sold	100.00%	100.00%	100.00%	100.00%
Real Estate Sold [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for impairment, net of tax	$ (6)	$ 2,974	$ 1,666	$ 3,348
Operating Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold \| property		3	4	4
Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold \| property	1	3	3	3

Other Assets Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Goodwill, net	$ 313,180	$ 314,143	$ 331,884
Investments	45,244	41,287
Prepaid and other	35,595	17,937
Derivative assets	4,367	17,482
Furniture, fixtures, and equipment, net	6,590	6,127
Deferred financing costs, net	5,769	6,851
Total other assets	$ 410,745	$ 403,827

Other Assets Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Other Assets Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill Gross, Beginning balance	$ 316,858	$ 331,884
Goodwill Gross, additions	0	500
Goodwill Gross, allocated to Provision for impairment	0	0
Goodwill Gross, allocated to Properties held for sale	0	(1,159)
Goodwill, ending balance	314,552	316,858
Goodwill, Accumulated Impairment Losses, Beginning balance	(2,715)	0
Goodwill Accumulated Impairment Losses, additions	0	0
Goodwill Accumulated Impairment Losses, allocated to Provision for impairment	(963)	(12,628)
Goodwill Accumulated Impairment Losses, allocated to Properties held for sale	0	0
Goodwill, Accumulated Impairment Losses, Ending balance	(1,372)	(2,715)
Goodwill, Beginning balance	314,143	331,884
Goodwill additions	0	500
Goodwill allocated to Provision for impairment	(963)	(12,628)
Goodwill allocated to Properties held for sale	0	(1,159)
Goodwill, Ending balance	313,180	314,143
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Goodwill [Line Items]
Goodwill Gross, allocated to Provision for impairment	(1,779)	(9,913)
Goodwill Gross, allocated to Gain on sale of real estate	(527)	(4,454)
Goodwill Accumulated Impairment Losses, allocated to Provision for impairment	1,779	9,913
Goodwill Accumulated Impairment Losses, allocated to Gain on sale of real estate	527	0
Goodwill allocated to Provision for impairment	0	0
Goodwill allocated to Gain on sale of real estate	$ 0	$ (4,454)

Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 3,678,465	$ 3,715,212
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	4.50%
Debt, Weighted Average Effective Interest Rate	4.00%
Long-term Debt	$ 344,963	403,306
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	4.00%
Debt, Weighted Average Effective Interest Rate	4.40%
Long-term Debt	$ 2,522,514	2,475,322
Total credit facilities	683,970	708,734
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,994,495	3,006,478
Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	3.40%
Debt, Weighted Average Effective Interest Rate	3.60%
Line of Credit [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities	$ 120,000	145,000
Term Loan [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	2.40%
Debt, Weighted Average Effective Interest Rate	2.50%
Term Loan [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities	$ 563,970	563,734
London Interbank Offered Rate (LIBOR) [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Contractual Interest Rate	3.50%
Debt, Weighted Average Effective Interest Rate	3.60%
Long-term Debt	$ 127,018	$ 127,850

Notes Payable and Unsecured Credit Facilities Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 06, 2019
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 4,562	$ 5,513
Repayments of Unsecured Debt	250,000	$ 150,000
Prepayment premium mortgage [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	1,000
Prepayment premium unsecured debt [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 9,600
Senior Notes [Member] \| Notes Due March 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 300,000
Debt Instrument, Interest Rate, Stated Percentage			4.65%
Debt Instrument, Discount Percent			99.661%
Notes Payable to Banks [Member] \| 250M 4.8% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.80%
Repayments of Unsecured Debt	$ 250,000
Mortgages [Member]
Debt Instrument [Line Items]
Repayments of First Mortgage Bond	$ 52,700
Mortgages [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Mortgages [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.25%

Notes Payable and Unsecured Credit Facilities Schedule of maturities of long-term debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 4,924
Long-term Debt, Maturities, Repayments of Principal in Year Two	350,361
Long-term Debt, Maturities, Repayments of Principal in Year Three	87,850
Long-term Debt, Maturities, Repayments of Principal in Year Four	702,646
Long-term Debt, Maturities, Repayments of Principal in Year Five	69,452
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,486,859
Debt Instrument, Unamortized Discount (Premium), Net	(23,627)
Total	3,678,465	$ 3,715,212
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total	2,522,514	$ 2,475,322
Scheduled Principal Payments [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	4,924
Long-term Debt, Maturities, Repayments of Principal in Year Two	11,287
Long-term Debt, Maturities, Repayments of Principal in Year Three	11,599
Long-term Debt, Maturities, Repayments of Principal in Year Four	11,798
Long-term Debt, Maturities, Repayments of Principal in Year Five	10,077
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,013
Debt Instrument, Unamortized Discount (Premium), Net	0
Total	76,698
Mortgages [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	39,074
Long-term Debt, Maturities, Repayments of Principal in Year Three	76,251
Long-term Debt, Maturities, Repayments of Principal in Year Four	5,848
Long-term Debt, Maturities, Repayments of Principal in Year Five	59,375
Long-term Debt, Maturities, Repayments of Principal after Year Five	209,846
Debt Instrument, Unamortized Discount (Premium), Net	4,890
Total	395,284
Unsecured Debt [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	300,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	685,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,250,000
Debt Instrument, Unamortized Discount (Premium), Net	(28,517)
Total	$ 3,206,483

Derivatives (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
Derivatives (Details) - USD ($) $ in Thousands	Mar. 07, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Unsecured notes		$ 683,970		$ 683,970		$ 708,734
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		(9,227)	$ 4,289	(14,716)	$ 13,794
Amount reclassified from accumulated other comprehensive loss		584	1,415	408	3,553
Interest Expense		37,173	$ 38,074	74,925	$ 74,859
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				5,300
Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value		4,367		4,367		17,482
Interest Rate Cash Flow Hedge Liability at Fair Value		(1,619)		(1,619)		(5,491)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value		4,367		4,367		17,482
Interest Rate Cash Flow Hedge Liability at Fair Value		(1,619)		(1,619)		(5,491)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net		2,748		$ 2,748		11,991
Treasury Lock [Member]
Derivative [Line Items]
Derivative, Inception Date				Dec. 06, 2018
Derivative, Maturity Date				Jun. 28, 2019
Derivative, Notional Amount		$ 250,000		$ 250,000
Derivative, Description of Variable Rate Basis				30 year U.S. Treasury
Derivative, Fixed Interest Rate	4.65%	3.147%		3.147%
Interest Rate Cash Flow Hedge Asset at Fair Value		$ 0		$ 0
Interest Rate Cash Flow Hedge Liability at Fair Value						(5,491)
Unsecured notes	$ 300,000
Unsecured notes maturity period	2049-03
Debt Instrument, Term	30 years
Treasury Lock [Member] \| Accumulated Other Comprehensive Income (Loss) [Member]
Derivative [Line Items]
Unsecured notes	$ 5,700
Derivative $300M Term [Member]
Derivative [Line Items]
Derivative, Inception Date				Apr. 03, 2017
Derivative, Maturity Date				Dec. 02, 2020
Derivative, Notional Amount		$ 300,000		$ 300,000
Derivative, Description of Variable Rate Basis				1 Month LIBOR with Floor
Derivative, Fixed Interest Rate		1.824%		1.824%
Interest Rate Cash Flow Hedge Asset at Fair Value						3,759
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (240)		$ (240)
Derivatives 200K @ 1.04770% and 65K @ 1.07000% [Member]
Derivative [Line Items]
Derivative, Inception Date				Aug. 01, 2016
Derivative, Maturity Date				Jan. 05, 2022
Derivative, Notional Amount		$ 265,000		$ 265,000
Derivative, Description of Variable Rate Basis				1 Month LIBOR with Floor
Derivative, Fixed Interest Rate		1.053%		1.053%
Interest Rate Cash Flow Hedge Asset at Fair Value		$ 3,975		$ 3,975		10,838
Derivative @ 1.30250% 20.0M [Member]
Derivative [Line Items]
Derivative, Inception Date				Apr. 07, 2016
Derivative, Maturity Date				Apr. 01, 2023
Derivative, Notional Amount		$ 19,942		$ 19,942
Derivative, Description of Variable Rate Basis				1 Month LIBOR
Derivative, Fixed Interest Rate		1.303%		1.303%
Interest Rate Cash Flow Hedge Asset at Fair Value		$ 217		$ 217		880
Derivative $33M Swap [Member]
Derivative [Line Items]
Derivative, Inception Date				Dec. 01, 2016
Derivative, Maturity Date				Nov. 01, 2023
Derivative, Notional Amount		$ 33,000		$ 33,000
Derivative, Description of Variable Rate Basis				1 Month LIBOR
Derivative, Fixed Interest Rate		1.49%		1.49%
Interest Rate Cash Flow Hedge Asset at Fair Value		$ 175		$ 175		1,376
Derivative @ 2.36600% 37.5K [Member]
Derivative [Line Items]
Derivative, Inception Date				Jun. 02, 2017
Derivative, Maturity Date				Jun. 02, 2027
Derivative, Notional Amount		$ 37,452		$ 37,452
Derivative, Description of Variable Rate Basis				1 Month LIBOR with Floor
Derivative, Fixed Interest Rate		2.366%		2.366%
Interest Rate Cash Flow Hedge Asset at Fair Value						$ 629
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (1,379)		$ (1,379)
Swap [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				$ 6,500

Leases (Details) $ in Thousands	3 Months Ended		6 Months Ended
Leases (Details) $ in Thousands	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Fixed and in-substance fixed lease income	$ 197,413		$ 399,291
Variable lease income	62,610		125,445
Above/below market rent amortization			(19,496)	$ (19,326)
Uncollectible amounts in lease income	(580)		(1,444)
Total lease income	266,236	$ 272,203	543,539	539,713
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year	389,051		389,051			$ 761,151
Lessor, Operating Lease, Payments to be Received, Two Years	735,879		735,879			693,848
Lessor, Operating Lease, Payments to be Received, Three Years	653,515		653,515			608,587
Lessor, Operating Lease, Payments to be Received, Four Years	561,918		561,918			516,369
Lessor, Operating Lease, Payments to be Received, Five Years	460,749		460,749			414,424
Lessor, Operating Lease, Payments to be Received, Thereafter	1,841,436		1,841,436			1,691,203
Lessor, Operating Lease, Payments to be Received	$ 4,642,548		$ 4,642,548			4,685,582
Number of Properties Subject to Ground Leases \| property	22		22
Last Ground Lease Expiration Date			2101
Last Office Lease Expiration Date			2029
Operating Lease, Expense	$ 5,167	$ 5,000	$ 10,453	$ 9,200
Variable Lease, Cost	575		1,147
Operating cash flows from operating leases	3,721		7,412
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	7,858		7,858
Lessee, Operating Lease, Liability, Payments, Due Year Two	15,682		15,682
Lessee, Operating Lease, Liability, Payments, Due Year Three	14,537		14,537
Lessee, Operating Lease, Liability, Payments, Due Year Four	13,591		13,591
Lessee, Operating Lease, Liability, Payments, Due Year Five	13,102		13,102
Lessee, Operating Lease, Liability, Payments, Due after Year Five	570,036		570,036
Lessee, Operating Lease, Total Undiscounted Lease Liabilities	634,806		634,806
Lessee, Operating Lease, Present Value Discount	(410,847)		(410,847)
Lease liabilities	223,959		223,959		$ 225,400	0
Operating Leases, Future Minimum Payments Due, Next Twelve Months						15,077
Operating Leases, Future Minimum Payments, Due in Two Years						14,733
Operating Leases, Future Minimum Payments, Due in Three Years						13,893
Operating Leases, Future Minimum Payments, Due in Four Years						13,151
Operating Leases, Future Minimum Payments, Due in Five Years						12,558
Operating Leases, Future Minimum Payments, Due Thereafter						467,706
Operating Leases, Future Minimum Payments Due						537,118
Lessor [Member]
Operating Leased Assets [Line Items]
Above/below market rent amortization	6,793		20,247
Ground Lease [Member]
Operating Leased Assets [Line Items]
Operating Lease, Expense	3,528		7,200
Variable Lease, Cost	444		873
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	5,336		5,336
Lessee, Operating Lease, Liability, Payments, Due Year Two	10,706		10,706
Lessee, Operating Lease, Liability, Payments, Due Year Three	10,674		10,674
Lessee, Operating Lease, Liability, Payments, Due Year Four	10,698		10,698
Lessee, Operating Lease, Liability, Payments, Due Year Five	10,914		10,914
Lessee, Operating Lease, Liability, Payments, Due after Year Five	564,081		564,081
Lessee, Operating Lease, Total Undiscounted Lease Liabilities	612,409		612,409
Lessee, Operating Lease, Present Value Discount	(408,464)		(408,464)
Lease liabilities	$ 203,945		$ 203,945
Operating Lease, Weighted Average Discount Rate, Percent	5.20%		5.20%
Operating Lease, Weighted Average Remaining Lease Term	49 years 7 months 6 days		49 years 7 months 6 days
Operating Leases, Future Minimum Payments Due, Next Twelve Months						10,672
Operating Leases, Future Minimum Payments, Due in Two Years						10,439
Operating Leases, Future Minimum Payments, Due in Three Years						10,344
Operating Leases, Future Minimum Payments, Due in Four Years						10,258
Operating Leases, Future Minimum Payments, Due in Five Years						10,369
Operating Leases, Future Minimum Payments, Due Thereafter						461,762
Operating Leases, Future Minimum Payments Due						513,844
Office Lease [Member]
Operating Leased Assets [Line Items]
Operating Lease, Expense	$ 1,064		$ 2,106
Variable Lease, Cost	131		274
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	2,522		2,522
Lessee, Operating Lease, Liability, Payments, Due Year Two	4,976		4,976
Lessee, Operating Lease, Liability, Payments, Due Year Three	3,863		3,863
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,893		2,893
Lessee, Operating Lease, Liability, Payments, Due Year Five	2,188		2,188
Lessee, Operating Lease, Liability, Payments, Due after Year Five	5,955		5,955
Lessee, Operating Lease, Total Undiscounted Lease Liabilities	22,397		22,397
Lessee, Operating Lease, Present Value Discount	(2,383)		(2,383)
Lease liabilities	$ 20,014		$ 20,014
Operating Lease, Weighted Average Discount Rate, Percent	4.00%		4.00%
Operating Lease, Weighted Average Remaining Lease Term	5 years 8 months 12 days		5 years 8 months 12 days
Operating Leases, Future Minimum Payments Due, Next Twelve Months						4,405
Operating Leases, Future Minimum Payments, Due in Two Years						4,294
Operating Leases, Future Minimum Payments, Due in Three Years						3,549
Operating Leases, Future Minimum Payments, Due in Four Years						2,893
Operating Leases, Future Minimum Payments, Due in Five Years						2,189
Operating Leases, Future Minimum Payments, Due Thereafter						5,944
Operating Leases, Future Minimum Payments Due						$ 23,274
Fixed Lease Expense [Member]
Operating Leased Assets [Line Items]
Operating Lease, Expense	$ 4,592		$ 9,306

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 2,994,495		$ 2,994,495		$ 3,006,478
Unsecured credit facilities	683,970		683,970		708,734
Trading Securities, Change in Unrealized Holding Gain (Loss)	525,000	$ 291,000	2,700	$ (93,000)
Impairment of Real Estate	(10,441)	$ (12,533)	(12,113)	$ (28,587)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	37,093		37,093		33,354
Available-for-sale Securities	8,151		8,151		7,933
Interest Rate Derivative Assets, at Fair Value	4,367		4,367		17,482
Total	49,611		49,611		58,769
Interest Rate Cash Flow Hedge Liability at Fair Value	(1,619)		(1,619)		(5,491)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties	41,976		41,976		42,760
Impairment of Real Estate			(10,447)		(6,579)
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value	3,175,311		3,175,311		2,961,769
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	0		0		0
Available-for-sale Securities	8,151		8,151		7,933
Interest Rate Derivative Assets, at Fair Value	4,367		4,367		17,482
Total	12,518		12,518		25,415
Interest Rate Cash Flow Hedge Liability at Fair Value	(1,619)		(1,619)		(5,491)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties	41,976		41,976		42,760
Fair Value, Inputs, Level 2 [Member] \| Unsecured Credit Facilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured credit facilities, Fair Value	685,705		685,705		710,902
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	37,093		37,093		33,354
Available-for-sale Securities	0		0		0
Interest Rate Derivative Assets, at Fair Value	0		0		0
Total	37,093		37,093		33,354
Interest Rate Cash Flow Hedge Liability at Fair Value	0		0		0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties	0		0		0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	0		0		0
Available-for-sale Securities	0		0		0
Interest Rate Derivative Assets, at Fair Value	0		0		0
Total	0		0		0
Interest Rate Cash Flow Hedge Liability at Fair Value	0		0		0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties	$ 0		$ 0		$ 0

Equity and Capital Equity and Capital - Common Stock (Details) - USD ($)			6 Months Ended
	Feb. 05, 2019	Jan. 31, 2019	Jun. 30, 2019	Jun. 30, 2018
Class of Stock [Line Items]
Common stock remaining available for Issuance			500,000,000
Stock Repurchased and Retired During Period, Value			$ (32,778,000)	$ (124,989,000)
Stock Repurchase Program, Authorized Amount	$ 250,000,000
Stock Repurchase Program Expiration Date	Feb. 04, 2020
Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares		563,229
Stock Repurchased and Retired During Period, Value		$ (32,800,000)	(6,000)	$ (21,000)
Common Stock [Member] \| Average share price [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value Per Share		$ (58.17)
Accumulated Other Comprehensive Income (Loss) [Member] \| Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value			$ 0
ATM Equity Offering Program [Member]
Class of Stock [Line Items]
Shares issued under program			0	0
Maximum [Member]
Class of Stock [Line Items]
Equity Issuances, Common Shares Authorized for Issuance			500,000,000

Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			$ (927)
Opening adjustment due to change in accounting policy					$ 30,903
Other comprehensive (loss) income	$ (8,520)	$ 5,748	(14,048)	$ 17,272
Ending balance	(14,086)		(14,086)
Current period other comprehensive income (loss), net	(8,520)	5,748	(14,048)	17,272
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(805)	(6,262)
Opening adjustment due to change in accounting policy					12
Other comprehensive income (loss) before reclassifications			(13,874)	13,156
Amounts reclassified from AOCI			455	3,513
Other comprehensive (loss) income			(13,419)	16,669
Ending balance	(14,224)	10,419	(14,224)	10,419
Current period other comprehensive income (loss), net			(13,419)	16,669
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Accounting Standards Update 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance				(6,250)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(122)	(27)
Other comprehensive income (loss) before reclassifications			260	(75)
Other comprehensive (loss) income			260	(75)
Ending balance	138	(102)	138	(102)
Current period other comprehensive income (loss), net			260	(75)
Accumulated Net Unrealized Investment Gain (Loss) [Member] \| Accounting Standards Update 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance				(27)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(927)	(6,289)
Opening adjustment due to change in accounting policy					12
Other comprehensive income (loss) before reclassifications			(13,614)	13,081
Amounts reclassified from AOCI			455	3,513
Other comprehensive (loss) income	(7,990)	5,553	(13,159)	16,594
Ending balance	(14,086)	10,317	(14,086)	10,317
Current period other comprehensive income (loss), net	(7,990)	5,553	(13,159)	16,594
Accumulated Other Comprehensive Income (Loss) [Member] \| Accounting Standards Update 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance				(6,277)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			189	(112)
Opening adjustment due to change in accounting policy					2
Other comprehensive income (loss) before reclassifications			(842)	638
Amounts reclassified from AOCI			(47)	40
Other comprehensive (loss) income			(889)	678
Ending balance	(700)	568	(700)	568
Current period other comprehensive income (loss), net			(889)	678
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] \| Accounting Standards Update 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance				(110)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(738)	(6,401)
Opening adjustment due to change in accounting policy					$ 14
Other comprehensive income (loss) before reclassifications			(14,456)	13,719
Amounts reclassified from AOCI			408	3,553
Other comprehensive (loss) income			(14,048)	17,272
Ending balance	$ (14,786)	$ 10,885	(14,786)	10,885
Current period other comprehensive income (loss), net			$ (14,048)	17,272
AOCI Including Portion Attributable to Noncontrolling Interest [Member] \| Accounting Standards Update 2017-12 [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance				$ (6,387)

Stock-Based Compensation (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted \| shares	253,237
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 65.12

Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share Basic [Line Items]
Weighted average common shares/units outstanding for basic EPS/EPU	167,536,000	169,424,000	167,488,000	170,056,000
Weighted average common shares/units outstanding for diluted EPS/EPU	167,962,000	169,682,000	167,877,000	170,291,000
Income per common share - basic	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Income per common share - diluted	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Weighted Average Limited Partnership Units Outstanding, Basic	349,902	349,902	349,902	349,902
Partnership Interest [Member]
Earnings Per Share Basic [Line Items]
Weighted average common shares/units outstanding for basic EPS/EPU	167,886,000	169,774,000	167,838,000	170,406,000
Weighted average common shares/units outstanding for diluted EPS/EPU	168,312,000	170,032,000	168,227,000	170,641,000
Income per common unit - basic	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Income per common unit - diluted	$ 0.31	$ 0.28	$ 0.85	$ 0.59
Continuing Operations [Member]
Earnings Per Share Basic [Line Items]
Income from operations attributable to common stockholders/unit holders - basic	$ 51,728	$ 47,841	$ 142,174	$ 100,500
Income from operations attributable to common stockholders/unit holders - diluted	51,728	47,841	142,174	100,500
Continuing Operations [Member] \| Partnership Interest [Member]
Earnings Per Share Basic [Line Items]
Income from operations attributable to common stockholders/unit holders - basic	51,837	47,941	142,473	100,712
Income from operations attributable to common stockholders/unit holders - diluted	$ 51,837	$ 47,941	$ 142,473	$ 100,712

Commitments and Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50.0
Letters of Credit Outstanding, Amount	12.6	$ 9.4
Purchase Commitment, Remaining Minimum Amount Committed	$ 17.1
Maximum [Member] \| Operating Shopping Center [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	81.63%
Minimum [Member] \| Operating Shopping Center [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	16.63%

Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Stockholders Equity [Abstract]
Common stock/unit per share	$ 0.585	$ 0.555	$ 1.17	$ 1.11

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Capitalized interest	$ 1,996	$ 4,150
Partnership Interest [Member]
Capitalized interest	$ 1,996	$ 4,150

Real Estate Investments Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Business Combinations [Abstract]
Total liabilities assumed	$ 0	$ 9,700

Non-Qualified Deferred Compensation Plan (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Securities	$ 35,189	$ 31,351
Deferred compensation obligation	$ 35,049	$ 31,166