Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	May 09, 2019
Entity Registrant Name	REGENCY CENTERS CORP
Entity Central Index Key	0000910606
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		167,518,691
Partnership Interest [Member]
Entity Registrant Name	REGENCY CENTERS LP
Entity Central Index Key	0001066247
Entity Filer Category	Accelerated Filer

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Parent Company [Member]
Real Estate Investment Property, at Cost [Abstract]
Gross real estate investments at cost	$ 10,875,058	$ 10,863,162
Less: accumulated depreciation	1,605,681	1,535,444
Total Cost Net of Accumulated Depreciation	9,269,377	9,327,718
Investments in real estate partnerships	456,733	463,001
Real Estate Held-for-sale	15,275	60,516
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	42,784	45,190
Restricted cash	3,305	2,658
Tenant and other receivables	160,635	172,359
Deferred Costs, Leasing, Net	82,477	84,983
Acquired lease intangible assets, less accumulated amortization of $225,693 and $219,689 at March 31, 2019 and December 31, 2018, respectively	280,613	387,069
Other assets	412,851	403,827
Total assets	11,017,604	10,944,663
Liabilities:
Notes payable	3,009,886	3,006,478
Unsecured credit facilities	673,852	708,734
Accounts payable and other liabilities	183,983	224,807
Acquired lease intangible liabilities, less accumulated amortization of $99,163 and $92,746 at March 31, 2019 and December 31, 2018, respectively	475,065	496,726
Operating Lease, Liability	225,122	0
Tenants’ security, escrow deposits and prepaid rent	46,923	57,750
Total liabilities	4,614,831	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; 167,517,243 and 167,904,593 shares issued at March 31, 2019 and December 31, 2018, respectively	1,675	1,679
Treasury stock at cost, 410,963 and 390,163 shares held at March 31, 2019 and December 31, 2018, respectively	(21,226)	(19,834)
Additional paid-in-capital	7,639,353	7,672,517
Accumulated other comprehensive loss	(6,096)	(927)
Distributions in excess of net income	(1,263,011)	(1,255,465)
Total stockholders’ equity	6,350,695	6,397,970
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $23,615 and $20,532 at March 31, 2019 and December 31, 2018, respectively	10,641	10,666
Limited partners’ interests in consolidated partnerships	41,437	41,532
Stockholders' Equity Attributable to Noncontrolling Interest	52,078	52,198
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(6,402,773)	(6,450,168)
Total liabilities and equity	11,017,604	10,944,663
Operating Lease, Right-of-Use Asset	296,859	0
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Gross real estate investments at cost	10,875,058	10,863,162
Less: accumulated depreciation	1,605,681	1,535,444
Total Cost Net of Accumulated Depreciation	9,269,377	9,327,718
Investments in real estate partnerships	456,733	463,001
Real Estate Held-for-sale	15,275	60,516
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	42,784	45,190
Restricted cash	3,305	2,658
Tenant and other receivables	160,635	172,359
Deferred Costs, Leasing, Net	82,477	84,983
Acquired lease intangible assets, less accumulated amortization of $225,693 and $219,689 at March 31, 2019 and December 31, 2018, respectively	280,613	387,069
Other assets	412,851	403,827
Total assets	11,017,604	10,944,663
Liabilities:
Notes payable	3,009,886	3,006,478
Unsecured credit facilities	673,852	708,734
Accounts payable and other liabilities	183,983	224,807
Acquired lease intangible liabilities, less accumulated amortization of $99,163 and $92,746 at March 31, 2019 and December 31, 2018, respectively	475,065	496,726
Operating Lease, Liability	225,122	0
Tenants’ security, escrow deposits and prepaid rent	46,923	57,750
Total liabilities	4,614,831	4,494,495
Commitments and contingencies	0	0
Stockholders’ equity/Partners' capital:
General partner; 167,517,243 and 167,904,593 units outstanding at March 31, 2019 and December 31, 2018, respectively	6,356,791	6,398,897
Limited partners; 349,902 units outstanding at March 31, 2019 and December 31, 2018	10,641	10,666
Accumulated other comprehensive loss	(6,096)	(927)
Total partners’ capital	6,361,336	6,408,636
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	41,437	41,532
Total equity	6,402,773	6,450,168
Total liabilities and equity	11,017,604	10,944,663
Operating Lease, Right-of-Use Asset	$ 296,859	$ 0

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Parent Company [Member]
Deferred costs accumulated amortization	$ 102,141	$ 101,093
Accumulated amortization of acquired lease intangible assets	225,693	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 99,163	$ 92,746
Preferred stock, par value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	30,000,000	30,000,000
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	167,517,243	167,904,593
Exchangeable operating partnership units aggregate redemption value	$ 23,615	$ 20,532
Treasury stock, shares held at cost	410,963	390,163
Restricted Cash and Cash Equivalents	$ 3,305	$ 2,658
Partnership Interest [Member]
Deferred costs accumulated amortization	102,141	101,093
Accumulated amortization of acquired lease intangible assets	225,693	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 99,163	$ 92,746
Preferred units of general partner par value per unit	$ 0.01	$ 0.01
General partner units, outstanding	167,517,243	167,904,593
Limited partner units, outstanding	349,902	349,902
Restricted Cash and Cash Equivalents	$ 3,305	$ 2,658

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lease Income	$ 277,303
Document Fiscal Year Focus	2019
Other expense (income):
Provision for impairment, net of tax	$ 1,672	$ 374
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	(16,490)	(96)
Parent Company [Member]
Lease Income	277,303	267,510
Revenues:
Other Operating Income	1,982	2,025
Property Management Fee Revenue	6,972	7,158
Total revenues	286,257	276,693
Operating expenses:
Depreciation and amortization	97,194	88,525
Operating and maintenance	40,638	42,516
General and administrative	21,300	17,606
Real estate taxes	34,155	30,425
Other operating expenses	1,134	1,632
Total operating expenses	194,421	180,704
Other expense (income):
Interest expense, net	37,752	36,785
Provision for impairment, net of tax	1,672	16,054
Gain (Loss) on Extinguishment of Debt	10,591	162
Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss	(2,354)	(32)
Nonoperating Income (Expense)	31,171	52,873
Income from operations before equity in income of investments in real estate partnerships	60,665	43,116
Equity in income of investments in real estate partnerships	30,828	10,349
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	(16,490)	(96)
Net income	91,493	53,465
Noncontrolling interests:
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	190	111
Limited partners’ interests in consolidated partnerships	(857)	(694)
Income attributable to noncontrolling interests	(1,047)	(805)
Net income attributable to the Company	90,446	52,660
Net Income (Loss) Available to Common Stockholders, Basic	$ 90,446	$ 52,660
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Partnership Interest [Member]
Lease Income	$ 277,303	$ 267,510
Revenues:
Other Operating Income	1,982	2,025
Property Management Fee Revenue	6,972	7,158
Total revenues	286,257	276,693
Operating expenses:
Depreciation and amortization	97,194	88,525
Operating and maintenance	40,638	42,516
General and administrative	21,300	17,606
Real estate taxes	34,155	30,425
Other operating expenses	1,134	1,632
Total operating expenses	194,421	180,704
Other expense (income):
Interest expense, net	37,752	36,785
Provision for impairment, net of tax	1,672	16,054
Gain (Loss) on Extinguishment of Debt	10,591	162
Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss	(2,354)	(32)
Nonoperating Income (Expense)	31,171	52,873
Income from operations before equity in income of investments in real estate partnerships	60,665	43,116
Equity in income of investments in real estate partnerships	30,828	10,349
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	(16,490)	(96)
Net income	91,493	53,465
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(857)	(694)
Income attributable to noncontrolling interests	(857)	(694)
Net income attributable to common unit holders	$ 90,636	$ 52,771
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.54	$ 0.31

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Document Fiscal Year Focus	2019
Other comprehensive (loss) income:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (5,489)	$ 9,505
Parent Company [Member]
Net income	(91,493)	(53,465)
Other comprehensive (loss) income:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(5,489)	9,505
Reclassification adjustment of derivative instruments included in net income	(176)	2,138
Available-for-sale Securities, Gross Unrealized Gain	137	(119)
Other comprehensive (loss) income	(5,528)	11,524
Comprehensive income	85,965	64,989
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(1,047)	(805)
Other comprehensive (loss) income attributable to noncontrolling interests	(359)	483
Comprehensive income attributable to noncontrolling interests	688	1,288
Comprehensive income attributable to the Company	85,277	63,701
Partnership Interest [Member]
Net income	(91,493)	(53,465)
Other comprehensive (loss) income:
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(5,489)	9,505
Reclassification adjustment of derivative instruments included in net income	(176)	2,138
Available-for-sale Securities, Gross Unrealized Gain	137	(119)
Other comprehensive (loss) income	(5,528)	11,524
Comprehensive income	85,965	64,989
Less: comprehensive income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(857)	(694)
Other comprehensive (loss) income attributable to noncontrolling interests	(348)	460
Comprehensive income attributable to noncontrolling interests	509	1,154
Comprehensive income attributable to the Company	$ 85,456	$ 63,835

Consolidated Statement of Changes in Equity - USD ($) $ in Thousands	Parent Company [Member]	Partnership Interest [Member]	Common Stock [Member] Parent Company [Member]	Treasury Stock [Member] Parent Company [Member]	Additional Paid-in Capital [Member] Parent Company [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Parent Company [Member]	Distributions in Excess of Net Income [Member] Parent Company [Member]	Total Stockholders' Equity [Member] Parent Company [Member]	Noncontrolling Interest Exchangeable Operating Partnership Units [Member] Parent Company [Member]	Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Parent Company [Member]	Noncontrolling Interest [Member] Parent Company [Member]	Common Stock [Member] Parent Company [Member]	Common Stock [Member] Common Stock [Member] Parent Company [Member]	Common Stock [Member] Treasury Stock [Member] Parent Company [Member]	Common Stock [Member] Additional Paid-in Capital [Member] Parent Company [Member]	Common Stock [Member] Accumulated Other Comprehensive Income (Loss) [Member] Parent Company [Member]	Common Stock [Member] Distributions in Excess of Net Income [Member] Parent Company [Member]	Common Stock [Member] Total Stockholders' Equity [Member] Parent Company [Member]	Common Stock [Member] Noncontrolling Interest Exchangeable Operating Partnership Units [Member] Parent Company [Member]	Common Stock [Member] Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Parent Company [Member]	Common Stock [Member] Noncontrolling Interest [Member] Parent Company [Member]	Partners Capital Total [Member] Partnership Interest [Member]	Noncontrolling Interest [Member] Partnership Interest [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Partnership Interest [Member]	Limited Partner [Member] Partnership Interest [Member]	General Partner [Member] Partnership Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	$ 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]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	30,903	$ 30,903	0	0	0	$ 12	12	30,889	30,901	0	2	2											$ 30,901	$ 2	$ 12	$ 0	$ 30,889
Partners' Capital, Adjusted Balance		6,763,957																					6,733,860	30,097	(6,277)	10,907	6,729,230
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	52,660
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	53,465	53,465	0	0	0		0		52,660	111	694	805											52,771	694	0	111	52,660
Current period other comprehensive income, net	11,524	11,524	0	0	0	11,041	11,041	0	11,041	23	460												11,064		11,041	23	0
Other comprehensive (loss) income attributable to noncontrolling interests	483	460																						460
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition	(3)		0	(449)	446		0	0	(3)	0	0	0
Restricted stock issued, net of amortization	4,121	4,121	1	0	4,120		0	0	4,121	0	0	0											4,121	0	0	0	4,121
Common stock redeemed for taxes withheld for stock based compensation, net													$ 6,643	$ 0	$ 0	$ 6,643	$ 0	$ 0	$ 6,643	$ 0	$ 0	$ 0
Stock Repurchased and Retired During Period, Value													(124,989)	(21)	0	(124,968)	0	0	(124,989)	0		0
Common stock issued under dividend reinvestment plan	358	358											358	0	0	358	0	0	358	0	0	0
Common stock issued, net of issuance costs													10	0	0	10	0	0	10	0	0	0
Distributions to partners	(1,018)	(96,419)	0	0	0		0	0	0	0	(1,018)	(1,018)											(95,401)	(1,018)	0	(194)	(95,207)
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(124,989)																					(124,989)	0	0	0	(124,989)
Cash dividends declared - common stock/unit	95,401		0	0	0		0	95,207	95,207	194	0	194
Ending 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
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 (Loss) Attributable to Parent	90,446
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	91,493	91,493	0	0	0		0		90,446	190	857	1,047											90,636	857	0	190	90,446
Current period other comprehensive income, net	(5,528)	(5,528)	0	0	0	$ (5,169)	(5,169)	0	(5,169)	(11)	(348)												(5,180)		(5,169)	(11)	0
Other comprehensive (loss) income attributable to noncontrolling interests	(359)	(348)																						(348)
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition	0		0	(1,392)	1,392		0	0	0	0	0	0
Restricted stock issued, net of amortization	3,952	3,952	2	0	3,950		0	0	3,952	0	0	0											3,952	0	0	0	3,952
Common stock redeemed for taxes withheld for stock based compensation, net													6,051	0	0	6,051	0	0	6,051	0	0	0
Stock Repurchased and Retired During Period, Value													(32,778)	(6)	0	(32,772)	0	0	(32,778)	0	0	0
Common stock issued under dividend reinvestment plan	383	383											$ 383	$ 0	$ 0	$ 383	$ 0	$ 0	$ 383	$ 0	$ 0	$ 0
Contributions from partners	895	895	0	0	0		0	0	0	0	895	895											0	895	0	0	0
Distributions to partners	(1,565)	(99,761)	0	0	0		0	0	0	0	(1,565)	(1,565)											(98,196)	(1,565)	0	(204)	(97,992)
Common units issued as a result of common stock issued by Parent Company, net of repurchases		5,668																					5,668	0	0	0	5,668
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(32,778)																					(32,778)	0	0	0	(32,778)
Cash dividends declared - common stock/unit	98,196		0	0	0		0	97,992	97,992	204	0	204
Ending 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]
Partners' Capital Account, Redemptions	$ 0	$ 0	$ 0	$ 0	$ (66)		$ 0	$ 0	$ (66)	$ 0	$ 66	$ 66											$ (66)	$ 66	$ 0	$ 0	$ (66)

Consolidated Statement of Changes in Partner Capital Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Partnership Interest [Member]
Common unit redeemed as result of common stock redeemed by parent	$ (6,275)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 30,903
Partners' Capital, Adjusted Balance			6,763,957
Net income	53,465
Other comprehensive income (loss)	11,524
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	460
Deferred Compensation Plan	(3)
Partners' Capital Account, Distributions	(96,419)
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company	(124,989)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	4,121
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	6,605,381	$ 6,450,168	6,733,054
Partnership Interest [Member] \| Noncontrolling Interest [Member]
Common unit redeemed as result of common stock redeemed by parent	0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			2
Partners' Capital, Adjusted Balance			30,097
Net income	694
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	460
Deferred Compensation Plan	0
Partners' Capital Account, Distributions	(1,018)
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	30,233	41,532	30,095
Partnership Interest [Member] \| Partners Capital Total [Member]
Common unit redeemed as result of common stock redeemed by parent	(6,275)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			30,901
Partners' Capital, Adjusted Balance			6,733,860
Net income	52,771
Other comprehensive income (loss)	11,064
Deferred Compensation Plan	(3)
Partners' Capital Account, Distributions	(95,401)
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company	(124,989)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	4,121
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	6,575,148	6,408,636	6,702,959
Partnership Interest [Member] \| AOCI Attributable to Parent [Member]
Common unit redeemed as result of common stock redeemed by parent	0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			12
Partners' Capital, Adjusted Balance			(6,277)
Net income	0
Other comprehensive income (loss)	11,041
Deferred Compensation Plan	0
Partners' Capital Account, Distributions	0
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	4,764	(927)	(6,289)
Partnership Interest [Member] \| Limited Partner [Member]
Common unit redeemed as result of common stock redeemed by parent	0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			0
Partners' Capital, Adjusted Balance			10,907
Net income	111
Other comprehensive income (loss)	23
Deferred Compensation Plan	0
Partners' Capital Account, Distributions	(194)
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	10,847	10,666	10,907
Partnership Interest [Member] \| General Partner [Member]
Common unit redeemed as result of common stock redeemed by parent	(6,275)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			30,889
Partners' Capital, Adjusted Balance			6,729,230
Net income	52,660
Other comprehensive income (loss)	0
Deferred Compensation Plan	(3)
Partners' Capital Account, Distributions	(95,207)
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company	(124,989)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	4,121
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	6,559,537	$ 6,398,897	6,698,341
AOCI Attributable to Parent [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 12
Other comprehensive income (loss)	$ 11,041

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of above and below Market Leases	$ 13,454
Provision for impairment, net of tax	1,672	$ 374
Cash flows from investing activities:
Proceeds from sale of real estate investments	82,533	3,227
Partnership Interest [Member]
Cash flows from operating activities:
Net income	(91,493)	(53,465)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	97,194	88,525
Amortization of deferred loan costs and debt premiums	2,921	2,471
Amortization of above and below Market Leases	(13,090)	(8,181)
Share-based Compensation	3,475	3,397
Equity in income of investments in real estate partnerships	(30,828)	(10,349)
Gain on sale of real estate, net of tax	(16,490)	(96)
Provision for impairment, net of tax	1,672	16,054
Gain (Loss) on Extinguishment of Debt	10,591	162
Distribution of earnings from operations of investments in real estate partnerships	(14,417)	(13,319)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	5,719	0
Deferred compensation expense	2,314	40
Realized and unrealized gain on investments	(2,354)	(30)
Increase (Decrease) in Accounts and Other Receivables	(9,050)	(4,296)
Changes in assets and liabilities:
Deferred leasing costs	(2,491)	(1,189)
Other assets	(11,212)	(476)
Accounts payable and other liabilities	(8,908)	(13,793)
Tenants’ security, escrow deposits and prepaid rent	(10,671)	2,253
Net cash provided by operating activities	131,364	149,868
Cash flows from investing activities:
Acquisition of operating real estate	(15,722)	(20,071)
Payments for Deposits on Real Estate Acquisitions	(1,250)	0
Real estate development and capital improvements	(39,929)	(51,968)
Proceeds from sale of real estate investments	82,533	3,227
Payments for (Proceeds from) Loans Receivable	0	(462)
Investments in real estate partnerships	(19,587)	(39,330)
Proceeds from Equity Method Investment, Distribution, Return of Capital	41,587	2,328
Dividends on investment securities	116	71
Acquisition of investment securities	(5,359)	(7,543)
Proceeds from sale of investment securities	4,612	6,542
Net cash provided by (used in) investing activities	47,001	(107,206)
Cash flows from financing activities:
Payments Related to Tax Withholding for Share-based Compensation	(6,148)	(6,755)
Payments for Repurchase of Common Stock	(32,778)	(124,989)
Proceeds from sale of treasury stock	8	99
Distributions to limited partners in consolidated partnerships, net	(1,485)	(1,018)
Dividends paid to common stockholders	(97,812)	(95,043)
Repayments of Unsecured Debt	250,000	0
Proceeds from Issuance of Unsecured Debt	298,983	299,511
Proceeds from unsecured credit facilities	110,000	185,000
Repayment of unsecured credit facilities	(145,000)	(245,000)
Proceeds from notes payable	0	1,740
Repayments of Notes Payable	(40,315)	0
Scheduled principal payments	(2,235)	(2,773)
Payment of loan costs	(3,342)	(9,179)
Payment for Debt Extinguishment or Debt Prepayment Cost	10,647	0
Net cash (used in) provided by financing activities	(180,771)	1,593
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(2,406)	44,255
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	42,784	93,636
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,015 and $2,179 in 2019 and 2018, respectively)	42,421	30,467
Proceeds from Income Tax Refunds	(15)	(407)
Supplemental disclosure of non-cash transactions:
Noncash or Part Noncash Acquisition, Debt Assumed	0	9,700
Common stock issued under dividend reinvestment plan	383	358
Stock-based compensation, net of capitalization	573	837
Contributions from limited partners in consolidated partnerships, net	881	0
Common stock issued for dividend reinvestment in trust	238	205
Contribution of stock awards into trust	1,328	637
Distribution of stock held in trust	167	317
Unrealized Gain (Loss) on Securities	174	(128)
Parent Company [Member]
Capital Expenditures Incurred but Not yet Paid	10,494	0
Cash flows from operating activities:
Net income	(91,493)	(53,465)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	97,194	88,525
Amortization of deferred loan costs and debt premiums	2,921	2,471
Amortization of above and below Market Leases	(13,090)	(8,181)
Share-based Compensation	3,475	3,397
Equity in income of investments in real estate partnerships	(30,828)	(10,349)
Gain on sale of real estate, net of tax	(16,490)	(96)
Provision for impairment, net of tax	1,672	16,054
Gain (Loss) on Extinguishment of Debt	10,591	162
Distribution of earnings from operations of investments in real estate partnerships	(14,417)	(13,319)
(Payments for) Proceeds from Settlement of Derivative Instrument	(5,719)	0
Deferred compensation expense	2,314	40
Realized and unrealized gain on investments	(2,354)	(30)
Increase (Decrease) in Accounts and Other Receivables	(9,050)	(4,296)
Changes in assets and liabilities:
Deferred leasing costs	(2,491)	(1,189)
Other assets	(11,212)	(476)
Accounts payable and other liabilities	(8,908)	(13,793)
Tenants’ security, escrow deposits and prepaid rent	(10,671)	2,253
Net cash provided by operating activities	131,364	149,868
Cash flows from investing activities:
Acquisition of operating real estate	(15,722)	(20,071)
Payments for Deposits on Real Estate Acquisitions	(1,250)	0
Real estate development and capital improvements	(39,929)	(51,968)
Proceeds from sale of real estate investments	82,533	3,227
Payments for (Proceeds from) Loans Receivable	0	(462)
Investments in real estate partnerships	(19,587)	(39,330)
Proceeds from Equity Method Investment, Distribution, Return of Capital	41,587	2,328
Dividends on investment securities	116	71
Acquisition of investment securities	(5,359)	(7,543)
Proceeds from sale of investment securities	4,612	6,542
Net cash provided by (used in) investing activities	47,001	(107,206)
Cash flows from financing activities:
Payments Related to Tax Withholding for Share-based Compensation	(6,148)	(6,755)
Payments for Repurchase of Common Stock	(32,778)	(124,989)
Proceeds from sale of treasury stock	8	99
Distributions to limited partners in consolidated partnerships, net	(1,485)	(1,018)
Distributions to exchangeable operating partnership unit holders	(204)	(194)
Dividends paid to common stockholders	(97,608)	(94,849)
Repayments of Unsecured Debt	250,000	0
Proceeds from Issuance of Unsecured Debt	298,983	299,511
Proceeds from unsecured credit facilities	110,000	185,000
Repayment of unsecured credit facilities	(145,000)	(245,000)
Proceeds from notes payable	0	1,740
Repayments of Notes Payable	(40,315)	0
Scheduled principal payments	(2,235)	(2,773)
Payment of loan costs	(3,342)	(9,179)
Payment for Debt Extinguishment or Debt Prepayment Cost	10,647	0
Net cash (used in) provided by financing activities	(180,771)	1,593
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(2,406)	44,255
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	42,784	93,636
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,015 and $2,179 in 2019 and 2018, respectively)	42,421	30,467
Proceeds from Income Tax Refunds	(15)	(407)
Supplemental disclosure of non-cash transactions:
Noncash or Part Noncash Acquisition, Debt Assumed	0	9,700
Common stock issued under dividend reinvestment plan	383	358
Stock-based compensation, net of capitalization	573	837
Contributions from limited partners in consolidated partnerships, net	881	0
Common stock issued for dividend reinvestment in trust	238	205
Contribution of stock awards into trust	1,328	637
Distribution of stock held in trust	167	317
Unrealized Gain (Loss) on Securities	$ 174	$ (128)

Organization and Principles of Consolidation

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Principles of Consolidation

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 March 31, 2019, the Parent Company, the Operating Partnership, and their controlled subsidiaries on a consolidated basis owned 302 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 March 31, 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 one share of common stock 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 March 31, 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 as a whole, are as follows:



(in thousands)	March 31, 2019		December 31, 2018
Assets
Net real estate investments	$	128,175	112,085
Cash, cash equivalents and restricted cash	22,274		7,309
Liabilities
Notes payable	17,640		18,432
Equity
Limited partners’ interests in consolidated partnerships	31,146		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 all 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 the tenants do not exercise renewal options and the leases mature, the tenants must relinquish their space so it can be leased to a new tenant, which generally involves some level of cost to prepare the space for re-leasing. These costs are 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.

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 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 the package of practical expedients, 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 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 expects that collectibility is probable for all of its leases due to the Company’s credit checks on tenants and other creditworthiness analysis undertaken before entering into a new lease; therefore, income from all operating leases is initially recognized on a straight-line basis. Lease income each period is reduced by amounts considered uncollectible on a lease-by-lease basis, with any changes in collectibility assessments recognized as a current period adjustment to Lease income. 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.

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 22 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. 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 most cases, provide for renewal options. 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. See Note 7, Leases, for additional disclosures.

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.

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 March 31,
(in thousands)	Timing of satisfaction of performance obligations	2019		2018
Other property income	Point in time	$	1,982	2,025
Management, transaction and other fees
Property management services	Over time	$	3,764	3,768
Asset management services	Over time	1,777		1,703
Leasing services	Point in time	758		685
Other transaction fees	Point in time	673		1,002
Total management, transaction, and other fees		$	6,972	7,158

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 March 31, 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.

Real Estate Investments

3 Months Ended

Mar. 31, 2019

Business Combinations [Abstract]

Real Estate Investments

The following table details the shopping centers acquired or land acquired or leased for development:



(in thousands)		Three months ended March 31, 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	100.0%	$600	—	—	—
2/8/19	Melrose Market	Seattle, WA	Operating	100.0%	15,515	—	941	358
Total property acquisitions					$16,115	—	941	358
⁽¹⁾ The Company purchased a .17 acre land parcel adjacent to the Company's existing operating Pablo Plaza for redevelopment.

(in thousands)		Three months ended March 31, 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 in Blocks I	Seattle, WA	Operating	49.9%	$54,500	—	3,668	2,350
1/2/18	Ballard in 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
Total property acquisitions					$123,230	9,700	9,929	6,123

Property Dispositions

3 Months Ended

Mar. 31, 2019

Discontinued Operations and Disposal Groups [Abstract]

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 March 31,
(in thousands, except number sold data)	2019			2018
Net proceeds from sale of real estate investments	$	82,533		3,227
Gain on sale of real estate, net of tax	$	16,490		96
Provision for impairment of real estate sold	$	1,672		374
Number of operating properties sold	4			1
Number of land parcels sold	2			—
Percent interest sold	100		%	100	%

At March 31, 2019, the Company also had one property classified within Properties held for sale on the Consolidated Balance Sheets.

Other Assets Other Assets (Notes)

3 Months Ended

Mar. 31, 2019

Other Assets [Abstract]

Other Assets Disclosure [Text Block]

Other Assets

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



(in thousands)	March 31, 2019		December 31, 2018
Goodwill, net	$	314,143	314,143
Investments	44,400		41,287
Prepaid and other	30,099		17,937
Derivative assets	11,909		17,482
Furniture, fixtures, and equipment, net	5,990		6,127
Deferred financing costs, net	6,310		6,851
Total other assets	$	412,851	403,827

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



	March 31, 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 resulting from Equity One merger	—			—		—	500			—		500
Goodwill allocated to Provision for impairment	—			—		—	—			(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		(409	)	314,143	$	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

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

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	March 31, 2019			December 31, 2018
Notes payable:
Fixed rate mortgage loans	4.5%	4.1%	$	360,865		403,306
Variable rate mortgage loans	3.5%	3.6%	127,081		⁽¹⁾	127,850
Fixed rate unsecured public and private debt	4.0%	4.4%	2,521,940			2,475,322
Total notes payable			3,009,886			3,006,478
Unsecured credit facilities:
Line of Credit (the "Line") ⁽²⁾	3.5%	3.7%	110,000			145,000
Term loans	2.4%	2.5%	563,852			563,734
Total unsecured credit facilities			673,852			708,734
Total debt outstanding			$	3,683,738		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 (i) to repay a $39.5 million mortgage maturing in 2020 with an interest rate of 7.3%, including a prepayment premium of $1 million, (ii) 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, and (iii) for general corporate purposes.

As of March 31, 2019, scheduled principal payments and maturities on notes payable and unsecured credit facilities were as follows:



(in thousands)	March 31, 2019
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities	Unsecured Maturities ⁽¹⁾		Total
2019	$	7,284	13,216	—		20,500
2020	11,287		39,074	300,000		350,361
2021	11,599		76,251	—		87,850
2022	11,798		5,848	675,000		692,646
2023	10,043		59,375	—		69,418
Beyond 5 Years	27,013		209,843	2,250,000		2,486,856
Unamortized debt premium/(discount) and issuance costs	—		5,315	(29,208	)	(23,893	)
Total	$	79,024	408,922	3,195,792		3,683,738

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

The Company was in compliance as of March 31, 2019 with the financial and other covenants under its unsecured public and private placement debt and unsecured credit facilities.

Derivatives

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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		March 31, 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%		2,255			3,759
8/1/16	1/5/22	265,000		1 Month LIBOR with Floor	1.053%		8,110			10,838
4/7/16	4/1/23	20,000		1 Month LIBOR	1.303%		626			880
12/1/16	11/1/23	33,000		1 Month LIBOR	1.490%		918			1,376
6/2/17	6/2/27	37,500		1 Month LIBOR with Floor	2.366%		(224		)	629
							$	11,685		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 March 31, 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 March 31,					Three months ended March 31,					Three months ended March 31,
(in thousands)	2019			2018		2019			2018		2019		2018
Interest rate swaps	$	(5,489	)	9,505	Interest expense	$	(176	)	2,138	Interest expense, net	$	37,752	36,785

As of March 31, 2019, the Company expects approximately $1.6 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 $7.1 million related to previously settled swaps on the Company's ten and thirty year fixed rate unsecured debt.

Leases (Notes)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lessor, Operating Leases [Text Block]

7. 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 during the three months ended March 31, 2019, under ASC Topic 842, Leases, as either fixed or variable lease income based on the criteria specified in ASC 842:



		Three months ended March 31,
		2019
Operating lease income
Fixed and in-substance fixed lease income	$	201,878
Variable lease income		62,835
Other lease related income, net
Above/below market rent amortization		13,454
Uncollectible amounts in lease income		(864	)
Total lease income	$	277,303

Future minimum rents under non-cancelable operating leases as of March 31, 2019 and December 31, 2018, excluding variable lease payments, are as follows:



		Future Minimum Rents as of (in thousands)
Year Ending December 31,		March 31, 2019			December 31, 2018
2019	$	578,963	⁽¹	⁾	761,151
2020		713,553			693,848
2021		629,638			608,587
2022		537,753			516,369
2023		437,109			414,424
Thereafter		1,778,839			1,691,203
Total	$	4,675,855			4,685,582
⁽¹⁾ The future minimum rental income for 2019 as of March 31, 2019 includes amounts due between April 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. Buildings 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.

The ground and office lease expense continues to be 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 lined rent expense and variable lease expenses such as CPI increases, performance based rent and reimbursements of landlord costs:



		Three months ended March 31,
		2019
Operating lease expense
Ground leases	$	3,673
Office leases		1,042
Total fixed operating lease expense	$	4,715
Variable lease expense
Ground leases	$	428
Office leases		143
Total variable lease expense	$	571
Total Lease Expense	$	5,286
Cash paid for amounts included in the measurement of operating lease liabilities
Operating cash flows from operating leases	$	3,692

Operating lease expense under the Company's ground and office leases was $5.3 million and $4.2 million during the three months ended March 31, 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 March 31, 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⁾	$	8,004		3,807		11,811
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		598,327		5,955		604,282
Total undiscounted lease liabilities	$	649,323		23,682		673,005
Present value discount		(445,324	)	(2,559	)	(447,883	)
Lease liabilities		203,999		21,123		225,122
Weighted average discount rate		5.2	%	4.0	%
Weighted average remaining term		49.9 years		5.9 years

⁽¹⁾ The undiscounted lease liability maturities shown for 2019 are as of March 31, 2019, and includes amounts due between April 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

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

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:



	March 31, 2019			December 31, 2018
(in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial liabilities:
Notes payable	$	3,009,886	3,066,580	$	3,006,478	2,961,769
Unsecured credit facilities	$	673,852	675,769	$	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 March 31, 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) loss in the accompanying Consolidated Statements of Operations, and include unrealized gains of $2.2 million and unrealized losses of $384,000, during the three months ended March 31, 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 March 31, 2019
(in thousands)				Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs		Significant Unobservable Inputs
Assets:	Balance			(Level 1)	(Level 2)		(Level 3)
Securities	$	36,318		36,318	—		—
Available-for-sale debt securities	8,082			—	8,082		—
Interest rate derivatives	11,909			—	11,909		—
Total	$	56,309		36,318	19,991		—

Liabilities:
Interest rate derivatives	$	(224	)	—	(224	)	—



	Fair Value Measurements as of December 31, 2018
(in thousands)				Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs		Significant Unobservable Inputs
Assets:	Balance			(Level 1)	(Level 2)		(Level 3)
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	)	—

There were no assets measured at fair value on a nonrecurring basis as of March 31, 2019. 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 as of December 31, 2018:

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)

Properties held for sale

42,760

—

42,760

—

(6,579

)

During the year-ended December 31, 2018, the Company remeasured three properties, classified as held for sale, to fair value based on the expected selling price. 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

3 Months Ended

Mar. 31, 2019

Equity and Capital [Abstract]

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 three months ended March 31, 2019 or 2018. As of March 31, 2019, all $500 million of common stock remained available for issuance under this ATM equity program.

Share Repurchase Program

On February 7, 2018, the Company's Board authorized a common share repurchase program under which the Company may repurchase, from time to time, up to $250 million worth of shares of its outstanding common stock through open market purchases and/or in privately negotiated transactions. Any shares purchased will be retired. In January 2019, the Company settled 563,229 shares, repurchased in December 2018, for $32.8 million at an average price of $58.17 per share, under this repurchase program. The program was scheduled to expire on February 6, 2020; however, the program was closed upon the authorization by the Company's Board of a new share repurchase program, as further discussed below.

On February 5, 2019, the Company's Board authorized a new 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 March 31, 2019, no shares have been repurchased under this new program.

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
	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Debt Securities		AOCI		Cash Flow Hedges		AOCI		AOCI
Balance as of December 31, 2018	$	(805	)	(122	)	(927	)	189		189		(738	)
Other comprehensive income before reclassifications	(5,154		)	137		(5,017	)	(335	)	(335	)	(5,352	)
Amounts reclassified from AOCI ⁽¹⁾	(152		)	—		(152	)	(24	)	(24	)	(176	)
Current period other comprehensive income, net	(5,306		)	137		(5,169	)	(359	)	(359	)	(5,528	)
Balance as of March 31, 2019	$	(6,111	)	15		(6,096	)	(170	)	(170	)	(6,266	)

⁽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		AOCI
Balance as of December 31, 2017	$	(6,262	)	(27	)	(6,289	)	(112	)	(112	)	(6,401	)
Opening adjustment due to change in accounting policy ⁽²⁾	12			—		12		2		2		14
Adjusted balance as of January 1, 2018	(6,250		)	(27	)	(6,277	)	(110	)	(110	)	(6,387	)
Other comprehensive income before reclassifications	9,003			(119	)	8,884		502		502		9,386
Amounts reclassified from AOCI ⁽¹⁾	2,157			—		2,157		(19	)	(19	)	2,138
Current period other comprehensive income, net	11,160			(119	)	11,041		483		483		11,524
Balance as of March 31, 2018	$	4,910		(146	)	4,764		373		373		5,137

⁽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.

Stock-Based Compensation	3 Months Ended
Stock-Based Compensation	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation During the three months ended March 31, 2019, the Company granted 233,237 shares of restricted stock with a weighted-average grant-date fair value of $65.02 per share. The Company records stock-based compensation expense within General and administrative expenses in the accompanying Consolidated Statements of Operations.

Non-Qualified Deferred Compensation Plan

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Non-Qualified Deferred Compensation Plan

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)	March 31, 2019		December 31, 2018	Location in Consolidated Balance Sheets
Assets:
Securities	$	34,278	31,351	Other assets
Liabilities:
Deferred compensation obligation	$	34,115	31,166	Accounts payable and other liabilities

Earnings per Share and Unit

3 Months Ended

Mar. 31, 2019

Earnings per Share and Unit [Abstract]

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 March 31,
(in thousands, except per share data)	2019		2018
Numerator:
Income from operations attributable to common stockholders - basic	$	90,446	52,660
Income from operations attributable to common stockholders - diluted	$	90,446	52,660
Denominator:
Weighted average common shares outstanding for basic EPS	167,440		170,704
Weighted average common shares outstanding for diluted EPS ⁽¹⁾	167,717		170,959

Income per common share – basic	$	0.54	0.31
Income per common share – diluted	$	0.54	0.31
⁽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 months ended March 31, 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 March 31,
(in thousands, except per share data)	2019		2018
Numerator:
Income from operations attributable to common unit holders - basic	$	90,636	52,771
Income from operations attributable to common unit holders - diluted	$	90,636	52,771
Denominator:
Weighted average common units outstanding for basic EPU	167,790		171,054
Weighted average common units outstanding for diluted EPU ⁽¹⁾	168,067		171,309

Income per common unit – basic	$	0.54	0.31
Income per common unit – diluted	$	0.54	0.31
⁽¹⁾ Includes the dilutive impact of unvested restricted stock using the treasury stock method.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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 March 31, 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 March 31, 2019, the Company has an option to purchase up to an additional 81.63% ownership interest in an operating shopping center by December 2019 and currently expects to acquire an additional 16.63% interest by that date for approximately $16.7 million.

Organization and Principles of Consolidation (Policies)

3 Months Ended

Mar. 31, 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 as a whole, are as follows:



(in thousands)	March 31, 2019		December 31, 2018
Assets
Net real estate investments	$	128,175	112,085
Cash, cash equivalents and restricted cash	22,274		7,309
Liabilities
Notes payable	17,640		18,432
Equity
Limited partners’ interests in consolidated partnerships	31,146		30,280

Revenue Recognition, Services, Management Fees [Policy Text Block]

Revenues and Other Receivables



		Three months ended March 31,
(in thousands)	Timing of satisfaction of performance obligations	2019		2018
Other property income	Point in time	$	1,982	2,025
Management, transaction and other fees
Property management services	Over time	$	3,764	3,768
Asset management services	Over time	1,777		1,703
Leasing services	Point in time	758		685
Other transaction fees	Point in time	673		1,002
Total management, transaction, and other fees		$	6,972	7,158

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 $1.3 million and $6.5 million during the three months ended March 31, 2018 and the year ended December 31, 2018, respectively. Previous capitalization of legal costs was $0.4 million and $1.6 million during the three months ended March 31, 2018 and the year ended December 31, 2018, respectively, 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 Topic 842 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)

3 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

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 $1.3 million and $6.5 million during the three months ended March 31, 2018 and the year ended December 31, 2018, respectively. Previous capitalization of legal costs was $0.4 million and $1.6 million during the three months ended March 31, 2018 and the year ended December 31, 2018, respectively, 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 Topic 842 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 (Tables)

3 Months Ended

Mar. 31, 2019

Business Acquisition [Line Items]

Schedule of business acquisitions

The following table details the shopping centers acquired or land acquired or leased for development:



(in thousands)		Three months ended March 31, 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	100.0%	$600	—	—	—
2/8/19	Melrose Market	Seattle, WA	Operating	100.0%	15,515	—	941	358
Total property acquisitions					$16,115	—	941	358
⁽¹⁾ The Company purchased a .17 acre land parcel adjacent to the Company's existing operating Pablo Plaza for redevelopment.

(in thousands)		Three months ended March 31, 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 in Blocks I	Seattle, WA	Operating	49.9%	$54,500	—	3,668	2,350
1/2/18	Ballard in 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
Total property acquisitions					$123,230	9,700	9,929	6,123

Property Dispositions (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(in thousands, except number sold data)	2019			2018
Net proceeds from sale of real estate investments	$	82,533		3,227
Gain on sale of real estate, net of tax	$	16,490		96
Provision for impairment of real estate sold	$	1,672		374
Number of operating properties sold	4			1
Number of land parcels sold	2			—
Percent interest sold	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)

3 Months Ended

Mar. 31, 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)	March 31, 2019		December 31, 2018
Goodwill, net	$	314,143	314,143
Investments	44,400		41,287
Prepaid and other	30,099		17,937
Derivative assets	11,909		17,482
Furniture, fixtures, and equipment, net	5,990		6,127
Deferred financing costs, net	6,310		6,851
Total other assets	$	412,851	403,827

Schedule of Goodwill [Table Text Block]

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



	March 31, 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 resulting from Equity One merger	—			—		—	500			—		500
Goodwill allocated to Provision for impairment	—			—		—	—			(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		(409	)	314,143	$	316,858		(2,715	)	314,143

Notes Payable and Unsecured Credit Facilities (Tables)

3 Months Ended

Mar. 31, 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	March 31, 2019			December 31, 2018
Notes payable:
Fixed rate mortgage loans	4.5%	4.1%	$	360,865		403,306
Variable rate mortgage loans	3.5%	3.6%	127,081		⁽¹⁾	127,850
Fixed rate unsecured public and private debt	4.0%	4.4%	2,521,940			2,475,322
Total notes payable			3,009,886			3,006,478
Unsecured credit facilities:
Line of Credit (the "Line") ⁽²⁾	3.5%	3.7%	110,000			145,000
Term loans	2.4%	2.5%	563,852			563,734
Total unsecured credit facilities			673,852			708,734
Total debt outstanding			$	3,683,738		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.

Schedule of maturities of long-term debt

As of March 31, 2019, scheduled principal payments and maturities on notes payable and unsecured credit facilities were as follows:



(in thousands)	March 31, 2019
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities	Unsecured Maturities ⁽¹⁾		Total
2019	$	7,284	13,216	—		20,500
2020	11,287		39,074	300,000		350,361
2021	11,599		76,251	—		87,850
2022	11,798		5,848	675,000		692,646
2023	10,043		59,375	—		69,418
Beyond 5 Years	27,013		209,843	2,250,000		2,486,856
Unamortized debt premium/(discount) and issuance costs	—		5,315	(29,208	)	(23,893	)
Total	$	79,024	408,922	3,195,792		3,683,738

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

Derivatives (Tables)

3 Months Ended

Mar. 31, 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		March 31, 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%		2,255			3,759
8/1/16	1/5/22	265,000		1 Month LIBOR with Floor	1.053%		8,110			10,838
4/7/16	4/1/23	20,000		1 Month LIBOR	1.303%		626			880
12/1/16	11/1/23	33,000		1 Month LIBOR	1.490%		918			1,376
6/2/17	6/2/27	37,500		1 Month LIBOR with Floor	2.366%		(224		)	629
							$	11,685		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.

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 March 31,					Three months ended March 31,					Three months ended March 31,
(in thousands)	2019			2018		2019			2018		2019		2018
Interest rate swaps	$	(5,489	)	9,505	Interest expense	$	(176	)	2,138	Interest expense, net	$	37,752	36,785

Leases (Tables) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Lessor, Lease, Description [Line Items]

Lessor, Operating Lease, Description

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



		Three months ended March 31,
		2019
Operating lease expense
Ground leases	$	3,673
Office leases		1,042
Total fixed operating lease expense	$	4,715
Variable lease expense
Ground leases	$	428
Office leases		143
Total variable lease expense	$	571
Total Lease Expense	$	5,286
Cash paid for amounts included in the measurement of operating lease liabilities
Operating cash flows from operating leases	$	3,692

Operating Lease, Lease Income [Table Text Block]



		Three months ended March 31,
		2019
Operating lease income
Fixed and in-substance fixed lease income	$	201,878
Variable lease income		62,835
Other lease related income, net
Above/below market rent amortization		13,454
Uncollectible amounts in lease income		(864	)
Total lease income	$	277,303

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

Future minimum rents under non-cancelable operating leases as of March 31, 2019 and December 31, 2018, excluding variable lease payments, are as follows:



		Future Minimum Rents as of (in thousands)
Year Ending December 31,		March 31, 2019			December 31, 2018
2019	$	578,963	⁽¹	⁾	761,151
2020		713,553			693,848
2021		629,638			608,587
2022		537,753			516,369
2023		437,109			414,424
Thereafter		1,778,839			1,691,203
Total	$	4,675,855			4,685,582
⁽¹⁾ The future minimum rental income for 2019 as of March 31, 2019 includes amounts due between April 1, 2019 and December 31, 2019.

Operating Lease, Expense

$ 5,286

$ 4,200

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



		Lease liabilities (in thousands)
Year Ending December 31,		Ground Leases		Office Leases		Total
2019 ⁽¹⁾	$	8,004		3,807		11,811
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		598,327		5,955		604,282
Total undiscounted lease liabilities	$	649,323		23,682		673,005
Present value discount		(445,324	)	(2,559	)	(447,883	)
Lease liabilities		203,999		21,123		225,122
Weighted average discount rate		5.2	%	4.0	%
Weighted average remaining term		49.9 years		5.9 years

⁽¹⁾ The undiscounted lease liability maturities shown for 2019 are as of March 31, 2019, and includes amounts due between April 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)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Summary of balance sheet fair values



	March 31, 2019			December 31, 2018
(in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial liabilities:
Notes payable	$	3,009,886	3,066,580	$	3,006,478	2,961,769
Unsecured credit facilities	$	673,852	675,769	$	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 March 31, 2019
(in thousands)				Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs		Significant Unobservable Inputs
Assets:	Balance			(Level 1)	(Level 2)		(Level 3)
Securities	$	36,318		36,318	—		—
Available-for-sale debt securities	8,082			—	8,082		—
Interest rate derivatives	11,909			—	11,909		—
Total	$	56,309		36,318	19,991		—

Liabilities:
Interest rate derivatives	$	(224	)	—	(224	)	—



	Fair Value Measurements as of December 31, 2018
(in thousands)				Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs		Significant Unobservable Inputs
Assets:	Balance			(Level 1)	(Level 2)		(Level 3)
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	)	—

Equity and Capital (Tables)

3 Months Ended

Mar. 31, 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
	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Debt Securities		AOCI		Cash Flow Hedges		AOCI		AOCI
Balance as of December 31, 2018	$	(805	)	(122	)	(927	)	189		189		(738	)
Other comprehensive income before reclassifications	(5,154		)	137		(5,017	)	(335	)	(335	)	(5,352	)
Amounts reclassified from AOCI ⁽¹⁾	(152		)	—		(152	)	(24	)	(24	)	(176	)
Current period other comprehensive income, net	(5,306		)	137		(5,169	)	(359	)	(359	)	(5,528	)
Balance as of March 31, 2019	$	(6,111	)	15		(6,096	)	(170	)	(170	)	(6,266	)

⁽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		AOCI
Balance as of December 31, 2017	$	(6,262	)	(27	)	(6,289	)	(112	)	(112	)	(6,401	)
Opening adjustment due to change in accounting policy ⁽²⁾	12			—		12		2		2		14
Adjusted balance as of January 1, 2018	(6,250		)	(27	)	(6,277	)	(110	)	(110	)	(6,387	)
Other comprehensive income before reclassifications	9,003			(119	)	8,884		502		502		9,386
Amounts reclassified from AOCI ⁽¹⁾	2,157			—		2,157		(19	)	(19	)	2,138
Current period other comprehensive income, net	11,160			(119	)	11,041		483		483		11,524
Balance as of March 31, 2018	$	4,910		(146	)	4,764		373		373		5,137

⁽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 (Tables)

3 Months Ended

Mar. 31, 2019

Retirement Benefits [Abstract]

Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]



(in thousands)	March 31, 2019		December 31, 2018	Location in Consolidated Balance Sheets
Assets:
Securities	$	34,278	31,351	Other assets
Liabilities:
Deferred compensation obligation	$	34,115	31,166	Accounts payable and other liabilities

Earnings per Share and Unit (Tables)

3 Months Ended

Mar. 31, 2019

Parent Company [Member]

Schedule of earnings per share

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



	Three months ended March 31,
(in thousands, except per share data)	2019		2018
Numerator:
Income from operations attributable to common stockholders - basic	$	90,446	52,660
Income from operations attributable to common stockholders - diluted	$	90,446	52,660
Denominator:
Weighted average common shares outstanding for basic EPS	167,440		170,704
Weighted average common shares outstanding for diluted EPS ⁽¹⁾	167,717		170,959

Income per common share – basic	$	0.54	0.31
Income per common share – diluted	$	0.54	0.31
⁽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 March 31,
(in thousands, except per share data)	2019		2018
Numerator:
Income from operations attributable to common unit holders - basic	$	90,636	52,771
Income from operations attributable to common unit holders - diluted	$	90,636	52,771
Denominator:
Weighted average common units outstanding for basic EPU	167,790		171,054
Weighted average common units outstanding for diluted EPU ⁽¹⁾	168,067		171,309

Income per common unit – basic	$	0.54	0.31
Income per common unit – diluted	$	0.54	0.31
⁽¹⁾ Includes the dilutive impact of unvested restricted stock using the treasury stock method.

Organization and Principles of Consolidation (Details)	3 Months Ended
Organization and Principles of Consolidation (Details)	Mar. 31, 2019 retail_shopping_center
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Document Period End Date	Mar. 31, 2019
Operations commenced date	Dec. 31, 1993
Wholly Owned Properties [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of Real Estate Properties	302
Unconsolidated Properties [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of Real Estate Properties	117
Parent Company [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%

Organization and Principles of Consolidation Variable Interest Entities (Details)
$ in Thousands

3 Months Ended

Mar. 31, 2019

USD ($)

retail_shopping_center

Dec. 31, 2018

USD ($)

Accounting Policies [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 as a whole, are as follows:



(in thousands)	March 31, 2019		December 31, 2018
Assets
Net real estate investments	$	128,175	112,085
Cash, cash equivalents and restricted cash	22,274		7,309
Liabilities
Notes payable	17,640		18,432
Equity
Limited partners’ interests in consolidated partnerships	31,146		30,280

Variable Interest Entity [Line Items]

Document Period End Date

Mar. 31, 2019

Variable Interest Entity, Consolidated, Carrying Amount, Liabilities

$ 17,640

$ 18,432

Noncontrolling Interest in Variable Interest Entity

31,146

30,280

Real Estate [Member]

Variable Interest Entity [Line Items]

Variable Interest Entity, Consolidated, Carrying Amount, Assets

128,175

112,085

Cash and Cash Equivalents [Member]

Variable Interest Entity [Line Items]

Variable Interest Entity, Consolidated, Carrying Amount, Assets

$ 22,274

$ 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

Organization and Principles of Consolidation Revenues and Tenant and Other Receivables (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) unit	Mar. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule of management, transaction, and other fees [Line Items]
Number of Properties Subject to Ground Leases \| unit	22
Last Ground Lease Expiration Date	2101
Last Office Lease Expiration Date	2029
Operating Lease, Liability			$ 225,400
Operating Lease, Right-of-Use Asset			$ 297,800
Management, transaction, and other fee [Member]
Schedule of management, transaction, and other fees [Line Items]
Accounts Receivable, Net	$ 11,000
Parent Company [Member]
Schedule of management, transaction, and other fees [Line Items]
Other Operating Income	1,982	$ 2,025
Property Management Fee Revenue	6,972	7,158
Accounts Receivable, Net	160,635			$ 172,359
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 30,903
Operating Lease, Liability	225,122			0
Operating Lease, Right-of-Use Asset	296,859			0
Parent Company [Member] \| Property management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Other Operating Income	1,982	2,025
Property Management Fee Revenue	3,764	3,768
Parent Company [Member] \| Asset management services [Member]
Schedule of management, transaction, and other fees [Line Items]
Property Management Fee Revenue	1,777	1,703
Parent Company [Member] \| Leasing services [Member]
Schedule of management, transaction, and other fees [Line Items]
Property Management Fee Revenue	758	685
Parent Company [Member] \| Other transaction fees [Member]
Schedule of management, transaction, and other fees [Line Items]
Property Management Fee Revenue	$ 673	$ 1,002
Parent Company [Member] \| Management, transaction, and other fee [Member]
Schedule of management, transaction, and other fees [Line Items]
Accounts Receivable, Net				$ 12,500

Organization and Principles of Consolidation Recent Accounting Pronouncements (Details) - Accounting Standards Update 2016-02 [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
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	$ 1,300	$ 6,500
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	$ 400	$ 1,600

Real Estate Investments Business Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Purchase Price	$ 16,115	$ 123,230
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	0	9,700
Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Intangible assets	941	9,929
Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Intangible assets	$ 358	$ 6,123
Pablo Plaza [Member]
Business Acquisition [Line Items]
Date Purchased	Jan. 08, 2019
Property Name	Pablo Plaza (1)
City/State	Jacksonville, FL
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Purchase Price	$ 600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	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
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Purchase Price	$ 15,515
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	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
Metuchen [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 05, 2018
Property Name		Metuchen
City/State		Metuchen, NJ
Business Acquisition, Percentage of Voting Interests Acquired		20.00%
Purchase Price		$ 33,830
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		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
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Purchase Price		$ 30,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		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
Ballard Blocks I [Member]
Business Acquisition [Line Items]
Date Purchased		Jan. 02, 2018
Property Name		Ballard in Blocks I
City/State		Seattle, WA
Business Acquisition, Percentage of Voting Interests Acquired		49.90%
Purchase Price		$ 54,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		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 in Blocks II
City/State		Seattle, WA
Business Acquisition, Percentage of Voting Interests Acquired		49.90%
Purchase Price		$ 4,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		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

Property Dispositions (Details) $ in Thousands	3 Months Ended
Property Dispositions (Details) $ in Thousands	Mar. 31, 2019 USD ($) property unit	Mar. 31, 2018 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale \| unit	1
Proceeds from sale of real estate investments	$ 82,533	$ 3,227
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	16,490	96
Provision for impairment, net of tax	$ 1,672	$ 374
Wholly Owned Properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	100.00%	100.00%
Parent Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate investments	$ 82,533	$ 3,227
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	16,490	96
Provision for impairment, net of tax	$ 1,672	$ 16,054
Operating Segments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties Sold \| property	4	1
Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties Sold \| property	2	0

Other Assets Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Current Assets [Line Items]
Goodwill	$ 314,143	$ 314,143	$ 331,884
Investments	44,400	41,287
Other Prepaid Expense, Current	30,099	17,937
Derivative Asset	11,909	17,482
Property, Plant and Equipment, Net	5,990	6,127
Deferred Costs and Other Assets	6,310	6,851
Parent Company [Member]
Other Current Assets [Line Items]
Other Assets	$ 412,851	$ 403,827

Other Assets Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
Other Assets Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Gross	$ 314,552		$ 316,858	$ 331,884
Goodwill, Impaired, Accumulated Impairment Loss	(409)		(2,715)	0
Goodwill	314,143		314,143	$ 331,884
Goodwill, Impairment Loss	0		(12,628)
Goodwill, Other Increase (Decrease)	0		(1,159)
Impairment of Real Estate	1,672	$ 374
Equity One Inc. [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	0		500
Accumulated Impairment Losses [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	0		(12,628)
Goodwill, Other Increase (Decrease)	0		0
Accumulated Impairment Losses [Member] \| Equity One Inc. [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	0		0
Goodwill, Gross [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	0		0
Goodwill, Other Increase (Decrease)	0		(1,159)
Goodwill, Gross [Member] \| Equity One Inc. [Member]
Goodwill [Line Items]
Goodwill, Purchase Accounting Adjustments	0		500
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	0		0
Goodwill, Written off Related to Sale of Business Unit	0		(4,454)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Accumulated Impairment Losses [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	(1,779)		(9,913)
Goodwill, Written off Related to Sale of Business Unit	(527)		0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Goodwill, Gross [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	(1,779)		(9,913)
Goodwill, Written off Related to Sale of Business Unit	$ (527)		$ (4,454)

Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt	$ 3,683,738	$ 3,715,212
Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	360,865	403,306
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term Debt	3,009,886	3,006,478
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities	673,852	708,734
Long-term Debt	2,521,940	2,475,322
Line of Credit [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities	110,000	145,000
Term Loan [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities	563,852	563,734
London Interbank Offered Rate (LIBOR) [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 127,081	$ 127,850
Contractual Rate [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.50%
Contractual Rate [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.50%
Contractual Rate [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.00%
Contractual Rate [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.50%
Contractual Rate [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.40%
Effective Rate [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.10%
Effective Rate [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.60%
Effective Rate [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.40%
Effective Rate [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.70%
Effective Rate [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.50%

Notes Payable and Unsecured Credit Facilities Schedule of maturities of long-term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 20,500
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	692,646
Long-term Debt, Maturities, Repayments of Principal in Year Five	69,418
Long-term Debt, Maturities, Repayments of Principal after Year Five	2,486,856
Debt Instrument, Unamortized Discount (Premium), Net	23,893
Long-term Debt	3,683,738	$ 3,715,212
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	2,521,940	$ 2,475,322
Scheduled Principal Payments [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	7,284
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	10,043
Long-term Debt, Maturities, Repayments of Principal after Year Five	27,013
Debt Instrument, Unamortized Discount (Premium), Net	0
Long-term Debt	79,024
Mortgage Loan Maturities [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	13,216
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	209,843
Debt Instrument, Unamortized Discount (Premium), Net	(5,315)
Long-term Debt	408,922
Unsecured Maturities [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	675,000
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	29,208
Long-term Debt	$ 3,195,792

Notes Payable and Unsecured Credit Facilities Narrative (Details) ratio in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 06, 2019 USD ($)
Prepayment premium mortgage [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 1.0
Prepayment premium unsecured debt [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 9.6
Senior Notes [Member] \| Notes Due March 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 300.0
Debt Instrument, Interest Rate, Stated Percentage		0.00%
Debt Instrument, Discount Percent		0.0
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Repayments of Secured Debt	$ 39.5
Notes Payable to Banks [Member] \| 150M 6% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Repayments of Unsecured Debt	$ 250.0

Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (5,489)	$ 9,505
Amount reclassified from accumulated other comprehensive loss	(176)	2,138
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 1,600
Treasury Lock [Member]
Derivative [Line Items]
Derivative, Inception Date	Dec. 06, 2018
Derivative, Maturity Date	Jun. 28, 2019
Derivative, Notional Amount	$ 250,000
Derivative, Description of Variable Rate Basis	30 year U.S. Treasury
Derivative, Fixed Interest Rate	3.147%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ 0
Interest Rate Cash Flow Hedge Liability at Fair Value			$ (5,491)
Derivative $300M Term [Member]
Derivative [Line Items]
Derivative, Inception Date	Apr. 03, 2017
Derivative, Maturity Date	Dec. 02, 2020
Derivative, Notional Amount	$ 300,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR with Floor
Derivative, Fixed Interest Rate	1.824%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (2,255)		(3,759)
Derivatives 200K @ 1.04770% and 65K @ 1.07000% [Member] [Domain]
Derivative [Line Items]
Derivative, Inception Date	Aug. 01, 2016
Derivative, Maturity Date	Jan. 05, 2022
Derivative, Notional Amount	$ 265,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR with Floor
Derivative, Fixed Interest Rate	1.053%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (8,110)		(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	$ 20,000
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Fixed Interest Rate	1.3025%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (626)		(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
Derivative, Description of Variable Rate Basis	1 Month LIBOR
Derivative, Fixed Interest Rate	1.49%
Interest Rate Cash Flow Hedge Asset at Fair Value	$ (918)		(1,376)
Derivative @ 2.36600% 37.5K [Member] [Domain]
Derivative [Line Items]
Derivative, Inception Date	Jun. 02, 2017
Derivative, Maturity Date	Jun. 02, 2027
Derivative, Notional Amount	$ 37,500
Derivative, Description of Variable Rate Basis	1 Month LIBOR with Floor
Derivative, Fixed Interest Rate	2.366%
Interest Rate Cash Flow Hedge Asset at Fair Value			(629)
Interest Rate Cash Flow Hedge Liability at Fair Value	$ (224)
Swap [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	7,100
Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	(11,909)		(17,482)
Interest Rate Cash Flow Hedge Liability at Fair Value	(224)		(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	(11,909)		(17,482)
Interest Rate Cash Flow Hedge Liability at Fair Value	(224)		(5,491)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net	11,685		$ 11,991
Parent Company [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(5,489)	9,505
Interest Expense	$ 37,752	$ 36,785

Leases (Details) $ in Thousands, ratio in Millions	3 Months Ended
Leases (Details) $ in Thousands, ratio in Millions	Mar. 31, 2019 USD ($) unit	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 15,077
Operating Lease, Expense	$ 5,286	$ 4,200
Variable Lease, Cost	$ 571
Number of Properties Subject to Ground Leases \| unit	22
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 11,811
Lessee, Operating Lease, Liability, Payments, Due Year Two	15,682
Lessee, Operating Lease, Liability, Payments, Due Year Three	14,537
Lessee, Operating Lease, Liability, Payments, Due Year Four	13,591
Lessee, Operating Lease, Liability, Payments, Due Year Five	13,102
Lessee, Operating Lease, Liability, Payments, Due after Year Five	604,282
Lessee, Operating Lease, Liability, Payments, Due	225,122
Lessor, Operating Lease, Payments to be Received, Two Years	713,553		693,848
Lessor, Operating Lease, Payments to be Received, Three Years	629,638		608,587
Lessor, Operating Lease, Payments to be Received, Four Years	537,753		516,369
Lessor, Operating Lease, Payments to be Received, Five Years	437,109		414,424
Lessor, Operating Lease, Payments to be Received, Thereafter	1,778,839		1,691,203
Lessor, Operating Lease, Payments to be Received	4,675,855		4,685,582
Operating cash flows from operating leases	$ 3,692
Last Ground Lease Expiration Date	2101
Last Office Lease Expiration Date	2029
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, Operating Lease, Payments to be Received, Remainder of Fiscal Year	$ 578,963		761,151
Lease Income	277,303
Fixed and in-substance fixed lease income	201,878
Variable lease income	62,835
Above/below market rent amortization	13,454
Amount of lease revenue determined to be uncollectible and charged to lease income	(864)
Fixed Lease Expense [Domain]
Operating Leased Assets [Line Items]
Operating Lease, Expense	4,715
Office Lease [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months			4,405
Operating Lease, Expense	1,042
Variable Lease, Cost	143
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	3,807
Lessee, Operating Lease, Liability, Payments, Due Year Two	4,976
Lessee, Operating Lease, Liability, Payments, Due Year Three	3,863
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,893
Lessee, Operating Lease, Liability, Payments, Due Year Five	2,188
Lessee, Operating Lease, Liability, Payments, Due after Year Five	5,955
Lessee, Operating Lease, Liability, Payments, Due	$ 21,123
Operating Lease, Weighted Average Discount Rate, Percent	0.00%
Operating Lease, Weighted Average Remaining Lease Term	5 years 10 months 24 days
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
Ground Lease [Member]
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months			10,672
Operating Lease, Expense	$ 3,673
Variable Lease, Cost	428
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	8,004
Lessee, Operating Lease, Liability, Payments, Due Year Two	10,706
Lessee, Operating Lease, Liability, Payments, Due Year Three	10,674
Lessee, Operating Lease, Liability, Payments, Due Year Four	10,698
Lessee, Operating Lease, Liability, Payments, Due Year Five	10,914
Lessee, Operating Lease, Liability, Payments, Due after Year Five	598,327
Lessee, Operating Lease, Liability, Payments, Due	$ 203,999
Operating Lease, Weighted Average Discount Rate, Percent	0.00%
Operating Lease, Weighted Average Remaining Lease Term	49 years 10 months 24 days
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
Undiscounted Amount [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	$ 673,005
Undiscounted Amount [Member] \| Office Lease [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	23,682
Undiscounted Amount [Member] \| Ground Lease [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Due	649,323
Discount Amount [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(447,883)
Discount Amount [Member] \| Office Lease [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(2,559)
Discount Amount [Member] \| Ground Lease [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	$ (445,324)

Fair Value Measurements (Details) - USD ($)	3 Months Ended		12 Months Ended
Fair Value Measurements (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Real Estate	$ (1,672,000)	$ (374,000)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total			$ 42,760,000
Impairment of Real Estate			(6,579,000)
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	36,318,000		33,354,000
Available-for-sale Securities	8,082,000		7,933,000
Interest Rate Derivative Assets, at Fair Value	11,909,000		17,482,000
Total	56,309,000		58,769,000
Derivative instruments, at fair value	(224,000)		(5,491,000)
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total			0
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	36,318,000		33,354,000
Available-for-sale Securities	0		0
Interest Rate Derivative Assets, at Fair Value	0		0
Total	36,318,000		33,354,000
Derivative instruments, at fair value	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value	3,066,580,000		2,961,769,000
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total			42,760,000
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
Available-for-sale Securities	8,082,000		7,933,000
Interest Rate Derivative Assets, at Fair Value	11,909,000		17,482,000
Total	19,991,000		25,415,000
Derivative instruments, at fair value	(224,000)		(5,491,000)
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total			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
Available-for-sale Securities	0		0
Interest Rate Derivative Assets, at Fair Value	0		0
Total	0		0
Derivative instruments, at fair value	0		0
Unsecured Credit Facilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured credit facilities, Fair Value	675,769,000		710,902,000
Parent Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities, Change in Unrealized Holding Gain (Loss)	2,200,000	(384,000)
Notes payable	3,009,886,000		3,006,478,000
Unsecured credit facilities	673,852,000		$ 708,734,000
Impairment of Real Estate	$ (1,672,000)	$ (16,054,000)

Equity and Capital Equity and Capital - Common Stock (Details) - USD ($)	3 Months Ended		12 Months Ended	24 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Feb. 04, 2020	Feb. 06, 2020	Feb. 05, 2019	Feb. 07, 2018
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 250,000,000	$ 250,000,000
Maximum [Member]
Class of Stock [Line Items]
Equity Issuances, Common Shares Authorized for Issuance	500,000,000
Parent Company [Member] \| Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	563,229
Stock Repurchased and Retired During Period, Value	$ (32,778,000)	$ (124,989,000)
Parent Company [Member] \| Common Stock [Member] \| Accumulated Other Comprehensive Income (Loss) [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	0	$ 0
Parent Company [Member] \| Common Stock [Member] \| Average share price [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ (58.17)
Subsequent Event [Member]
Class of Stock [Line Items]
Stock Repurchase Program Expiration Date			Feb. 04, 2020	Feb. 06, 2020

Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 12
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	$ (5,154)	$ 9,003
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(805)	(6,262)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(152)	2,157
Current period other comprehensive income, net	(5,306)	11,160
Ending balance	(6,111)	4,910
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	137	(119)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(122)	(27)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Current period other comprehensive income, net	137	(119)
Ending balance	15	(146)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			12
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5,017)	8,884
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(927)	(6,289)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(152)	2,157
Current period other comprehensive income, net	(5,169)	11,041
Ending balance	(6,096)	4,764
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(335)	502
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	189	(112)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(24)	(19)
Current period other comprehensive income, net	(359)	483
Ending balance	(170)	373
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(335)	502
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	189	(112)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(24)	(19)
Current period other comprehensive income, net	(359)	483
Ending balance	(170)	373
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 14
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5,352)	9,386
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(738)	(6,401)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(176)	2,138
Current period other comprehensive income, net	(5,528)	11,524
Ending balance	$ (6,266)	5,137
Accounting Standards Update 2017-12 [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance		(6,250)
Accounting Standards Update 2017-12 [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance		(27)
Accounting Standards Update 2017-12 [Member] \| Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance		(6,277)
Accounting Standards Update 2017-12 [Member] \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance		(110)
Accounting Standards Update 2017-12 [Member] \| AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance		(110)
Accounting Standards Update 2017-12 [Member] \| AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance		$ (6,387)

Stock-Based Compensation (Details) - Restricted Stock [Member]	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted \| shares	233,237
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 65.02

Non-Qualified Deferred Compensation Plan (Details) - Parent Company [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred Compensation Plan Assets	$ 34,278	$ 31,351
Deferred Compensation Liability, Current and Noncurrent	$ 34,115	$ 31,166

Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income per common unit - diluted
Weighted Average Limited Partnership Units Outstanding, Basic		349,902
Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 90,446	$ 52,660
Weighted average common units outstanding for basic EPU (in shares)	167,440,000	170,704,000
Weighted average common units outstanding for diluted EPU (in shares)	167,717,000	170,959,000
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Partnership Interest [Member]
Earnings Per Share [Abstract]
Weighted average common units outstanding for basic EPU (in shares)	167,790,000	171,054,000
Weighted average common units outstanding for diluted EPU (in shares)	168,067,000	171,309,000
Income per common unit - basic
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Income per common unit - diluted
Continuing operations (in dollars per share)	$ 0.54	$ 0.31
Continuing Operations [Member] \| Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	$ 90,446	$ 52,660
Net income for common stock unit/holders - diluted	90,446	52,660
Continuing Operations [Member] \| Partnership Interest [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders	90,636	52,771
Net income for common stock unit/holders - diluted	$ 90,636	$ 52,771

Commitments and Contingencies, Letters of Credit (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Letters of Credit Outstanding, Amount	$ 12,600,000	$ 9,400,000
Line of Credit Facility, Maximum Borrowing Capacity	50,000,000
Purchase Commitment, Remaining Minimum Amount Committed	$ 16,700,000
Maximum [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	81.63%
Minimum [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	16.63%

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Parent Company [Member]
Capitalized interest	$ 2,179	$ 1,016
Partnership Interest [Member]
Capitalized interest	$ 2,179	$ 1,016

Real Estate Investments Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Total liabilities assumed	$ 0	$ 9,700