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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2016	Aug. 03, 2016
Entity Registrant Name	REGENCY CENTERS CORP
Entity Central Index Key	0000910606
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		104,489,542
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	Jun. 30, 2016	Dec. 31, 2015
Real estate investments at cost:
Notes receivable	$ 10,480	$ 10,480
Liabilities:
Notes payable	1,674,631	1,699,771
Unsecured credit facilities	309,585	164,514
Parent Company [Member]
Real estate investments at cost:
Land, including amounts held for future development	1,639,958	1,479,814
Buildings and improvements	3,044,793	2,896,396
Properties in development	137,562	169,690
Gross real estate investments at cost	4,822,313	4,545,900
Less: accumulated depreciation	1,079,448	1,043,787
Total Cost Net of Accumulated Depreciation	3,742,865	3,502,113
Properties held for sale	29,365	0
Investments in real estate partnerships	279,270	306,206
Net real estate investments	4,051,500	3,808,319
Cash and cash equivalents	24,939	36,856
Restricted cash	3,505	3,767
Accounts receivable, net of allowance for doubtful accounts of $5,534 and $5,295 at June 30, 2016 and December 31, 2015, respectively	27,765	32,292
Straight-line rent receivable, net of reserve of $2,961 and $1,365 at June 30, 2016 and December 31, 2015, respectively	66,291	63,392
Notes receivable	10,480	10,480
Deferred Costs, Leasing, Net	68,297	66,367
Acquired lease intangible assets, less accumulated amortization of $50,553 and $45,639 at June 30, 2016 and December 31, 2015, respectively	124,325	105,380
Trading securities held in trust, at fair value	29,939	29,093
Other assets	29,561	26,935
Total assets	4,436,602	4,182,881
Liabilities:
Notes payable	1,674,631	1,699,771
Unsecured credit facilities	309,585	164,514
Accounts payable and other liabilities	165,611	164,515
Acquired lease intangible liabilities, less accumulated accretion of $20,240 and $17,555 at June 30, 2016 and December 31, 2015, respectively	57,776	42,034
Tenants’ security, escrow deposits and prepaid rent	26,974	29,427
Total liabilities	2,234,577	2,100,261
Commitments and contingencies (note 11)
Stockholders’ equity/Partners' capital:
Preferred stock, $0.01 par value per share, 30,000,000 shares authorized; 13,000,000 Series 6 and 7 shares issued and outstanding at June 30, 2016 and December 31, 2015, with liquidation preferences of $25 per share	325,000
Common stock, $0.01 par value per share,150,000,000 shares authorized; 99,486,537 and 97,212,638 shares issued at June 30, 2016 and December 31, 2015, respectively	995
Treasury stock at cost, 343,951 and 417,862 shares held at June 30, 2016 and December 31, 2015, respectively	(16,843)
Additional paid in capital	2,888,583
Accumulated other comprehensive loss	(80,038)
Distributions in excess of net income	(950,941)
Total stockholders’ equity	2,166,756
Noncontrolling interests:
Exchangeable operating partnership units, aggregate redemption value of $12,909 and $10,502 at June 30, 2016 and December 31, 2015, respectively	(2,013)
Limited partners’ interests in consolidated partnerships	37,282
Stockholders' Equity Attributable to Noncontrolling Interest	35,269
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,202,025	2,082,620
Total liabilities and equity	4,436,602	4,182,881
Partnership Interest [Member]
Real estate investments at cost:
Land, including amounts held for future development	1,639,958	1,479,814
Buildings and improvements	3,044,793	2,896,396
Properties in development	137,562	169,690
Gross real estate investments at cost	4,822,313	4,545,900
Less: accumulated depreciation	1,079,448	1,043,787
Total Cost Net of Accumulated Depreciation	3,742,865	3,502,113
Properties held for sale	29,365	0
Investments in real estate partnerships	279,270	306,206
Net real estate investments	4,051,500	3,808,319
Cash and cash equivalents	24,939	36,856
Restricted cash	3,505	3,767
Accounts receivable, net of allowance for doubtful accounts of $5,534 and $5,295 at June 30, 2016 and December 31, 2015, respectively	27,765	32,292
Straight-line rent receivable, net of reserve of $2,961 and $1,365 at June 30, 2016 and December 31, 2015, respectively	66,291	63,392
Notes receivable	10,480	10,480
Deferred Costs, Leasing, Net	68,297	66,367
Acquired lease intangible assets, less accumulated amortization of $50,553 and $45,639 at June 30, 2016 and December 31, 2015, respectively	124,325	105,380
Trading securities held in trust, at fair value	29,939	29,093
Other assets	29,561	26,935
Total assets	4,436,602	4,182,881
Liabilities:
Notes payable	1,674,631	1,699,771
Unsecured credit facilities	309,585	164,514
Accounts payable and other liabilities	165,611	164,515
Acquired lease intangible liabilities, less accumulated accretion of $20,240 and $17,555 at June 30, 2016 and December 31, 2015, respectively	57,776	42,034
Tenants’ security, escrow deposits and prepaid rent	26,974	29,427
Total liabilities	2,234,577	2,100,261
Commitments and contingencies (note 11)
Stockholders’ equity/Partners' capital:
Preferred units of general partner, $0.01 par value per unit, 13,000,000 units issued and outstanding at March 31, 2016 and December 31, 2015, liquidation preference of $25 per unit	325,000	325,000
General partner; 99,486,537 and 97,212,638 units outstanding at March 31, 2016 and December 31, 2015, respectively	1,921,794	1,787,802
Limited partners; 154,170 units outstanding at March 31, 2016 and December 31, 2015	(2,013)	(1,975)
Accumulated other comprehensive loss	(80,038)	(58,693)
Total partners’ capital	2,164,743	2,052,134
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	37,282	30,486
Total noncontrolling interests	37,282	30,486
Total equity	2,202,025	2,082,620
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,202,025	2,082,620
Total liabilities and equity	4,436,602	4,182,881
Preferred Stock [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	325,000	325,000
Common Stock [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	995	972
Treasury Stock [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(16,843)	(19,658)
Additional Paid-in Capital [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,888,583	2,742,508
AOCI Attributable to Parent [Member]
Stockholders’ equity/Partners' capital:
Accumulated other comprehensive loss	(80,038)	(58,693)
AOCI Attributable to Parent [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(80,038)	(58,693)
AOCI Attributable to Parent [Member] \| Partnership Interest [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(80,038)	(58,693)
Accumulated Distributions in Excess of Net Income [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(950,941)	(936,020)
Total Stockholders' Equity [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,166,756	2,054,109
Noncontrolling Interest Exchangeable Operating Partnership Units [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(2,013)	(1,975)
Noncontrolling Interests in Limited Partners Interest in Consolidated Partnerships [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	37,282	30,486
Noncontrolling Interests in Limited Partners Interest in Consolidated Partnerships [Member] \| Partnership Interest [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	37,282	30,486
Total Noncontrolling Interests [Member] \| Parent Company [Member]
Noncontrolling interests:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 35,269	$ 28,511

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Parent Company [Member]
Allowance for doubtful accounts receivable	$ 5,534	$ 5,295
Straight-line rent receivable allowance	2,961	1,365
Deferred costs accumulated amortization	80,816	76,823
Accumulated amortization of acquired lease intangible assets	50,553	45,639
Accumulated Accretion	$ 20,240	$ 17,555
Preferred stock, par value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	30,000,000	30,000,000
Preferred units of Series 6-7, units issued	13,000,000	13,000,000
Preferred units of Series 6-7, units outstanding	13,000,000	13,000,000
Preferred stock, liquidation preferences per share	$ 25	$ 25
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	99,486,537	97,212,638
Exchangeable operating partnership units aggregate redemption value	$ 12,909	$ 10,502
Treasury stock, shares held at cost	343,951	417,862
Partnership Interest [Member]
Allowance for doubtful accounts receivable	$ 5,534	$ 5,295
Straight-line rent receivable allowance	2,961	1,365
Deferred costs accumulated amortization	80,816	76,823
Accumulated amortization of acquired lease intangible assets	50,553	45,639
Accumulated accretion of acquired lease intangible liabilities	$ 20,240	$ 17,555
Preferred units of general partner par value per unit	$ 0.01	$ 0.01
Preferred units of Series 6-7, units issued	13,000,000	13,000,000
Preferred units of Series 6-7, units outstanding	13,000,000	13,000,000
Preferred stock, liquidation preferences per share	$ 25	$ 25
General partner units, outstanding	99,486,537	97,212,638
Limited partner units, outstanding	154,170	154,170

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other expense (income):
Provision for impairment	$ 0	$ 0	$ 1,666	$ 0
Discontinued operations, net:
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	548	5,657	13,417	6,460
Parent Company [Member]
Revenues:
Minimum rent	109,945	102,390	217,619	203,695
Percentage rent	453	300	2,156	2,108
Recoveries from tenants and other income	35,874	32,431	69,362	63,479
Management Fees Revenue	6,140	6,008	12,904	12,246
Total revenues	152,412	141,129	302,041	281,528
Operating expenses:
Depreciation and amortization	40,299	36,225	79,015	72,218
Operating and maintenance	23,709	20,185	46,394	41,358
General and administrative	16,350	15,099	32,649	31,477
Real estate taxes	16,769	15,667	32,639	30,798
Other operating expenses	2,440	1,779	4,747	2,943
Total operating expenses	99,567	88,955	195,444	178,794
Other expense (income):
Interest expense, net	24,401	26,675	48,544	53,308
Provision for impairment	0	0	1,666	0
Early extinguishment of debt	0	0	0	61
Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments	602	367	446	1,000
Total other expense	23,799	26,308	49,764	52,247
Income from operations before equity in income of investments in real estate partnerships	29,046	25,866	56,833	50,487
Equity in income of investments in real estate partnerships	11,050	6,757	23,971	12,324
Income from operations	40,096	32,623	80,804	62,811
Discontinued operations, net:
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	548	5,657	13,417	6,460
Net income	40,644	38,280	94,221	69,271
Noncontrolling interests:
Exchangeable operating partnership units	(64)	(61)	(150)	(110)
Limited partners’ interests in consolidated partnerships	(504)	(473)	(853)	(977)
Income attributable to noncontrolling interests	(568)	(534)	(1,003)	(1,087)
Net income attributable to the Company	40,076	37,746	93,218	68,184
Preferred stock dividends	(5,266)	(5,266)	(10,531)	(10,531)
Net Income (Loss) Available to Common Stockholders, Basic	$ 34,810	$ 32,480	$ 82,687	$ 57,653
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.36	$ 0.35	$ 0.85	$ 0.61
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.35	$ 0.34	$ 0.84	$ 0.61
Partnership Interest [Member]
Revenues:
Minimum rent	$ 109,945	$ 102,390	$ 217,619	$ 203,695
Percentage rent	453	300	2,156	2,108
Recoveries from tenants and other income	35,874	32,431	69,362	63,479
Management Fees Revenue	6,140	6,008	12,904	12,246
Total revenues	152,412	141,129	302,041	281,528
Operating expenses:
Depreciation and amortization	40,299	36,225	79,015	72,218
Operating and maintenance	23,709	20,185	46,394	41,358
General and administrative	16,350	15,099	32,649	31,477
Real estate taxes	16,769	15,667	32,639	30,798
Other operating expenses	2,440	1,779	4,747	2,943
Total operating expenses	99,567	88,955	195,444	178,794
Other expense (income):
Interest expense, net	24,401	26,675	48,544	53,308
Provision for impairment	0	0	1,666	0
Early extinguishment of debt	0	0	0	61
Marketable Securities, Gain (Loss), Excluding Other than Temporary Impairments	602	367	446	1,000
Total other expense	23,799	26,308	49,764	52,247
Income from operations before equity in income of investments in real estate partnerships	29,046	25,866	56,833	50,487
Equity in income of investments in real estate partnerships	11,050	6,757	23,971	12,324
Income from operations	40,096	32,623	80,804	62,811
Discontinued operations, net:
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	548	5,657	13,417	6,460
Net income	40,644	38,280	94,221	69,271
Noncontrolling interests:
Limited partners’ interests in consolidated partnerships	(504)	(473)	(853)	(977)
Income attributable to noncontrolling interests	(504)	(473)	(853)	(977)
Net income attributable to the Company	40,140	37,807	93,368	68,294
Distributions Paid To Preferred Unit Holders	5,266	5,266	10,531	10,531
Net income attributable to common unit holders	$ 34,874	$ 32,541	$ 82,837	$ 57,763
Income per common share/unit - basic:
Continuing operations (in dollars per share)	$ 0.36	$ 0.35	$ 0.85	$ 0.61
Income per common share/unit - diluted:
Continuing operations (in dollars per share)	$ 0.35	$ 0.34	$ 0.84	$ 0.61

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Parent Company [Member]
Interest income
Trading Securities, Change in Unrealized Holding Gain (Loss)	(275)	892	(505)	475
Partnership Interest [Member]
Interest income
Trading Securities, Change in Unrealized Holding Gain (Loss)	$ (275)	$ 892	$ (505)	$ 475

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other comprehensive (loss) income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (9,846)	$ 18,376	$ (26,631)	$ 4,494
Parent Company [Member]
Net income	(40,644)	(38,280)	(94,221)	(69,271)
Other comprehensive (loss) income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(9,846)	18,376	(26,631)	4,494
Less: reclassification adjustment of derivative instruments included in net income	2,500	2,250	4,952	4,500
Available-for-sale Securities, Gross Unrealized Gain	73	(30)	37	(30)
Other comprehensive (loss) income	(7,273)	20,596	(21,642)	8,964
Comprehensive income	33,371	58,876	72,579	78,235
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(568)	(534)	(1,003)	(1,087)
Other comprehensive (loss) income attributable to noncontrolling interests	(128)	119	(297)	15
Comprehensive income attributable to noncontrolling interests	440	653	706	1,102
Comprehensive income attributable to the Company	32,931	58,223	71,873	77,133
Partnership Interest [Member]
Net income	(40,644)	(38,280)	(94,221)	(69,271)
Other comprehensive (loss) income:
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(9,846)	18,376	(26,631)	4,494
Less: reclassification adjustment of derivative instruments included in net income	2,500	2,250	4,952	4,500
Available-for-sale Securities, Gross Unrealized Gain	73	(30)	37	(30)
Other comprehensive (loss) income	(7,273)	20,596	(21,642)	8,964
Comprehensive income	33,371	58,876	72,579	78,235
Less: comprehensive income (loss) attributable to noncontrolling interests:
Net income attributable to noncontrolling interests	(504)	(473)	(853)	(977)
Other comprehensive (loss) income attributable to noncontrolling interests	(117)	86	(263)	0
Comprehensive income attributable to noncontrolling interests	387	559	590	977
Comprehensive income attributable to the Company	$ 32,984	$ 58,317	$ 71,989	$ 77,258

Consolidated Statement of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Parent Company [Member]	Partnership Interest [Member]	Preferred Stock [Member] Parent Company [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]	Accumulated Other Comprehensive Income (Loss) [Member] Partnership Interest [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 Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Partnership Interest [Member]	Total Noncontrolling Interests [Member] Parent Company [Member]	General Partner Preferred and Common Units [Member] Partnership Interest [Member]	Limited Partners [Member] Partnership Interest [Member]	Total Partners' Capital [Member] Partnership Interest [Member]	Preferred Units [Member] Accumulated Other Comprehensive Income (Loss) [Member] Partnership Interest [Member]	Preferred Units [Member] Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Partnership Interest [Member]	Preferred Units [Member] General Partner Preferred and Common Units [Member] Partnership Interest [Member]	Preferred Units [Member] Limited Partners [Member] Partnership Interest [Member]	Preferred Units [Member] Total Partners' Capital [Member] Partnership Interest [Member]	Common Stock [Member] Parent Company [Member]	Common Stock [Member] Preferred 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] Total Noncontrolling Interests [Member] Parent Company [Member]
Beginning balance at Dec. 31, 2014	$ 1,936,482	$ 1,936,482	$ 325,000	$ 941	$ (19,382)	$ 2,540,153		$ (57,748)	$ (57,748)	$ (882,372)	$ 1,906,592	$ (1,914)	$ 31,804	$ 31,804	$ 29,890	$ 1,964,340	$ (1,914)	$ 1,904,678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	69,271	69,271	0	0	0	0		0	0		68,184	110	977	977	1,087	68,184	110	68,294
Net Income (Loss) Attributable to Parent	68,184	68,294
Current period other comprehensive income, net	8,964	8,964	0	0	0	0	$ 8,949	8,949	8,949	0	8,949	15	0			0	15	8,964
Other comprehensive (loss) income attributable to noncontrolling interests	15	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition	0		0	0	(8)	8		0		0	0	0	0		0
Restricted stock issued, net of amortization	7,004	7,004	0	3	0	7,001		0	0	0	7,004	0	0	0	0	7,004	0	7,004
Common stock redeemed for taxes withheld for stock based compensation, net																								$ 9,793	$ 0	$ 1	$ 0	$ 9,792	$ 0	$ 0	$ 9,793	$ 0	$ 0	$ 0
Common stock issued for dividend reinvestment plan	683	683																							0	0	0	683	0	0	683	0	0	0
Common stock issued for stock offerings, net of issuance costs			0	0	0	955		0		0	955	0	0		0
Contributions from partners	256	256	0	0	0	0		0	0	0	0	0	256	256	256	0	0	0
Distributions to partners	(1,965)	(93,424)	0	0	0	0		0	0	0	0	0	(1,965)	(1,965)	(1,965)	(91,308)	(151)	(91,459)
Cash dividends declared: preferred stock/unit	10,531	10,531	0	0	0	0		0		10,531	10,531	0	0		0				$ 0	$ 0	$ 10,531	$ 0	$ 10,531
Preferred Stock Dividends, Income Statement Impact	10,531
Cash dividends declared - common stock/unit	91,459		0	0	0	0		0		91,308	91,308	151	0		151
Ending Balance at Jun. 30, 2015	1,909,867	$ 1,909,867	325,000	943	(19,390)	2,539,008		(48,799)	$ (48,799)	(916,027)	1,880,735	(1,940)	31,072	$ 31,072	29,132	$ 1,929,534	$ (1,940)	$ 1,878,795
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Partners' Capital Account, Units, Redeemed		8,155							0					0		8,155	0	8,155
Beginning balance at Dec. 31, 2015	2,082,620	$ 2,082,620	325,000	972	(19,658)	2,742,508		(58,693)	$ (58,693)	(936,020)	2,054,109	(1,975)	30,486	$ 30,486	28,511	$ 2,112,802	$ (1,975)	$ 2,052,134
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	94,221	94,221	0	0	0	0		0	0		93,218	150	853	853	1,003	93,218	150	93,368
Net Income (Loss) Attributable to Parent	93,218	93,368
Current period other comprehensive income, net	(21,642)	(21,642)	0	0	0	0	$ (21,345)	(21,345)	(21,345)	0	(21,345)	(34)	(263)			0	(34)	(21,379)
Other comprehensive (loss) income attributable to noncontrolling interests	(297)	(263)
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition	0		0	0	2,815	(2,815)		0		0	0	0	0		0
Restricted stock issued, net of amortization	6,804	6,804	0	2	0	6,802		0	0	0	6,804	0	0	0	0	6,804	0	6,804
Common stock redeemed for taxes withheld for stock based compensation, net																								7,876	0	0	0	7,876	0	0	7,876	0	0	0
Common stock issued for dividend reinvestment plan	547	547																							0	0	0	547	0	0	547	0	0	0
Common stock issued for stock offerings, net of issuance costs																								$ 149,788	$ 0	$ 21	$ 0	$ 149,767	$ 0	$ 0	$ 149,788	$ 0	$ 0	$ 0
Contributions from partners	8,600	8,600	0	0	0	0		0	0	0	0	0	8,600	8,600	8,600	0	0	0
Distributions to partners	(2,744)	(100,506)	0	0	0	(350)		0	0	0	(350)	0	(2,394)	(2,394)	(2,394)	97,958	(154)	(98,112)
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances		142,459							0					0		142,459	0	142,459
Cash dividends declared: preferred stock/unit	10,531	10,531	0	0	0	0		0			10,531	0	0		0				$ 0	$ 0	$ 10,531	$ 0	$ 10,531
Preferred Stock Dividends, Income Statement Impact	10,531
Cash dividends declared - common stock/unit	97,762		0	0	0	0		0		97,608	97,608	154	0		154
Ending Balance at Jun. 30, 2016	$ 2,202,025	$ 2,202,025	$ 325,000	$ 995	$ (16,843)	$ 2,888,583		$ (80,038)	$ (80,038)	$ (950,941)	$ 2,166,756	$ (2,013)	$ 37,282	$ 37,282	$ 35,269	$ 2,246,794	$ (2,013)	$ 2,164,743

Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Common stock/unit per share	$ 1.00	$ 0.97

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from investing activities:
Proceeds from sale of real estate investments	$ 38,705	$ 26,382
Parent Company [Member]
Cash flows from operating activities:
Net income	94,221	69,271
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	79,015	72,218
Amortization of deferred loan cost and debt premium	4,831	5,058
(Accretion) and amortization of above and below market lease intangibles, net	(1,176)	(936)
Share-based Compensation	5,189	5,620
Stock-based compensation, net of capitalization	1,723	1,493
Equity in income of investments in real estate partnerships	(23,971)	(12,324)
Gain on sale of real estate	(13,417)	(6,460)
Provision for impairment	(1,666)	0
Early extinguishment of debt	0	61
Distribution of earnings from operations of investments in real estate partnerships	(26,159)	(22,719)
Deferred compensation expense	429	581
Realized and unrealized loss (gain) on investments	(446)	(1,000)
Increase (Decrease) in Restricted Cash for Operating Activities	31	(1,587)
Changes in assets and liabilities:
Accounts receivable, net	(6,841)	(5,895)
Straight-line rent receivables, net	(3,071)	(3,552)
Deferred leasing costs	(5,386)	(5,470)
Other assets	(1,718)	(3,209)
Accounts payable and other liabilities	(9,447)	(12,004)
Tenants’ security, escrow deposits and prepaid rent	(2,693)	1,270
Net cash provided by operating activities	143,313	127,413
Cash flows from investing activities:
Acquisition of operating real estate	(297,448)	0
Payments for Deposits on Real Estate Acquisitions	(1,500)	(4,500)
Real estate development and capital improvements	(75,320)	(109,118)
Proceeds from sale of real estate investments	36,751	26,567
Investments in real estate partnerships	(3,823)	(1,344)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	25,746	15,014
Dividends on investment securities	137	87
Acquisition of securities	(46,306)	(20,581)
Proceeds from sale of securities	45,739	17,169
Net cash used in investing activities	(316,024)	(76,706)
Cash flows from financing activities:
Net proceeds from common stock issuance	149,788	955
Proceeds from sale of treasury stock	904	0
Distributions to limited partners in consolidated partnerships, net	(2,214)	(1,722)
Distributions to exchangeable operating partnership unit holders	(154)	(151)
Dividends paid to common stockholders	(97,061)	(90,625)
Dividends paid to preferred stockholders	(10,531)	(10,531)
Proceeds from unsecured credit facilities	295,000	85,000
Repayment of unsecured credit facilities	(150,000)	(40,000)
Proceeds from notes payable	20,000	2,399
Repayments of Notes Payable	(41,584)	(76,027)
Scheduled principal payments	(3,062)	(2,921)
Payment of loan costs	(292)	(3,746)
Net cash provided by (used in) financing activities	160,794	(137,369)
Net decrease in cash and cash equivalents	(11,917)	(86,662)
Cash and cash equivalents at beginning of the period	36,856	113,776
Cash and cash equivalents at end of the period	24,939	27,114
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,766 and $4,015 in 2016 and 2015, respectively)	44,153	53,458
Income Taxes Paid	0	697
Supplemental disclosure of non-cash transactions:
Change in fair value of derivative instruments	(26,630)	4,494
Common stock issued for dividend reinvestment plan	547	683
Contributions from limited partners in consolidated partnerships, net	8,420	13
Common stock issued for dividend reinvestment in trust	384	432
Contribution of stock awards into trust	1,488	1,475
Distribution of stock held in trust	4,060	1,898
Unrealized Gain (Loss) on Securities	37	(30)
Partnership Interest [Member]
Cash flows from operating activities:
Net income	94,221	69,271
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	79,015	72,218
Amortization of deferred loan cost and debt premium	4,831	5,058
(Accretion) and amortization of above and below market lease intangibles, net	(1,176)	(936)
Share-based Compensation	5,189	5,620
Stock-based compensation, net of capitalization	1,723	1,493
Equity in income of investments in real estate partnerships	(23,971)	(12,324)
Gain on sale of real estate	(13,417)	(6,460)
Provision for impairment	(1,666)	0
Early extinguishment of debt	0	61
Distribution of earnings from operations of investments in real estate partnerships	(26,159)	(22,719)
Deferred compensation expense	429	581
Realized and unrealized loss (gain) on investments	(446)	(1,000)
Increase (Decrease) in Restricted Cash for Operating Activities	31	(1,587)
Changes in assets and liabilities:
Accounts receivable, net	(6,841)	(5,895)
Straight-line rent receivables, net	(3,071)	(3,552)
Deferred leasing costs	(5,386)	(5,470)
Other assets	(1,718)	(3,209)
Accounts payable and other liabilities	(9,447)	(12,004)
Tenants’ security, escrow deposits and prepaid rent	(2,693)	1,270
Net cash provided by operating activities	143,313	127,413
Cash flows from investing activities:
Acquisition of operating real estate	(297,448)	0
Payments for Deposits on Real Estate Acquisitions	(1,500)	(4,500)
Real estate development and capital improvements	(75,320)	(109,118)
Proceeds from sale of real estate investments	36,751	26,567
Investments in real estate partnerships	(3,823)	(1,344)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	25,746	15,014
Dividends on investment securities	137	87
Acquisition of securities	(46,306)	(20,581)
Proceeds from sale of securities	45,739	17,169
Net cash used in investing activities	(316,024)	(76,706)
Cash flows from financing activities:
Net proceeds from common units issued as a result of common stock issued by Parent Company	149,788	955
Proceeds from sale of treasury stock	904	0
Distributions to limited partners in consolidated partnerships, net	(2,214)	(1,722)
Dividends paid to common stockholders	(97,215)	(90,776)
Dividends paid to preferred stockholders	(10,531)	(10,531)
Proceeds from unsecured credit facilities	295,000	85,000
Repayment of unsecured credit facilities	(150,000)	(40,000)
Proceeds from notes payable	20,000	2,399
Repayments of Notes Payable	(41,584)	(76,027)
Scheduled principal payments	(3,062)	(2,921)
Payment of loan costs	(292)	(3,746)
Net cash provided by (used in) financing activities	160,794	(137,369)
Net decrease in cash and cash equivalents	(11,917)	(86,662)
Cash and cash equivalents at beginning of the period	36,856	113,776
Cash and cash equivalents at end of the period	24,939	27,114
Supplemental disclosure of cash flow information:
Cash paid for interest (net of capitalized interest of $1,766 and $4,015 in 2016 and 2015, respectively)	44,153	53,458
Income Taxes Paid	0	697
Supplemental disclosure of non-cash transactions:
Change in fair value of derivative instruments	(26,630)	4,494
Common stock issued for dividend reinvestment plan	547	683
Contributions from limited partners in consolidated partnerships, net	8,420	13
Non-controlling interest recorded, fair value	0	0
Common stock issued for dividend reinvestment in trust	384	432
Contribution of stock awards into trust	1,488	1,475
Distribution of stock held in trust	4,060	1,898
Unrealized Gain (Loss) on Securities	$ 37	$ (30)

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Parent Company [Member]
Capitalized interest	$ 1,766	$ 4,015
Partnership Interest [Member]
Capitalized interest	$ 1,766	$ 4,015

Organization and Principles of Consolidation

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Principles of Consolidation

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 engages in the ownership, management, leasing, acquisition, and development of retail shopping centers through the Operating Partnership, and has no other assets or liabilities other than through its investment in the Operating Partnership. The Parent Company currently owns approximately 99.8% of the outstanding common Partnership Units of the Operating Partnership. As of June 30, 2016, the Parent Company, the Operating Partnership, and their controlled subsidiaries on a consolidated basis (the "Company” or “Regency”) directly owned 199 retail shopping centers and held partial interests in an additional 112 retail shopping centers through 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 a fair statement of 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 or properties where it owns less than 100%, but which it controls. Control is determined using an evaluation based on accounting standards related to the consolidation of voting interest entities and variable interest entities ("VIEs"). For joint ventures that are determined to be a VIE, the Company consolidates the entity where it is deemed to be the primary beneficiary. Determination of the primary beneficiary is based on whether an entity has (1) the power to direct the activities of the VIE that most significantly impact the entity's economic performance, and (2) the obligation to absorb losses of the entity that could potentially be significant to the VIE or the right to receive benefits from the entity that could potentially be significant to the VIE. The Company's determination of the primary beneficiary considers all relationships between it and the VIE, including management agreements and other contractual arrangements.

Ownership of the Operating Partnership

The Operating Partnership’s capital includes general and limited common Partnership Units. As of June 30, 2016, the Parent Company owned approximately 99.8% of the outstanding common Partnership Units of the Operating Partnership with the remaining limited Partnership Units held by third parties (“Exchangeable operating partnership units” or “EOP units”). 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 characteristics of a controlling financial interest. As such, the Operating Partnership is considered a variable interest entity, and the Parent Company is the primary beneficiary which consolidates it. The Parent Company’s only investment is the Operating Partnership.

Real Estate Partnerships

Regency owns 112 properties through partnerships with institutional investors, other real estate developers and/or operators, and individual parties who help Regency source transactions for development and investment ("the Partners", "limited partners"). Regency has a variable interest in these entities through its equity interests. As managing member, Regency maintains the books and records and typically provides leasing and property management to the partnerships. The partners’ level of involvement varies from protective decisions (debt, bankruptcy, selling primary asset(s) of business) to involvement in approving leases, operating budgets, and capital budgets.


•	Those partnerships for which the partners only have protective rights are considered VIEs under ASC 810, Consolidation. Regency is the primary beneficiary of these VIEs as Regency has power over these partnerships and they operate primarily for the benefit of Regency. As such, Regency consolidates these entities and reports the limited partners’ interest as noncontrolling interests.

The majority of the operations of the VIEs are funded with cash flows generated by the properties, or in the case of developments, with capital contributions or third party construction loans. Regency does not provide financial support to the VIEs.

The major classes of assets, liabilities, and non-controlling equity interests held by these VIEs are as follows:



(in thousands)	June 30, 2016		December 31, 2015
Assets	⁽¹⁾
Real estate assets, net	$	252,114	81,424
Cash and cash equivalents	10,822		790
Liabilities
Notes payable	17,578		17,948
Equity
Limited partners’ interests in consolidated partnerships	19,208		11,058

⁽¹⁾ As discussed in note 2, during the six months ended June 30, 2016, the Company acquired a controlling interest in two partnerships; one was formed to develop a shopping center and the second to acquire a mixed-use retail operating center. The structure of both partnerships is considered a VIE with Regency as the primary beneficiary.


•	Those partnerships for which the partners are involved in the day to day decisions and do not have any other aspects that would cause them to be considered VIEs, are evaluated for consolidation using the voting interest model.


◦	Those partnerships which Regency has a controlling financial interest are consolidated and the limited partners’ ownership interest and share of net income is recorded as noncontrolling interest.

◦

Those partnerships which Regency does not have a controlling financial interest are accounted for using the equity method and its ownership interest is recognized through single-line presentation as Investments in Real Estate Partnerships, in the Consolidated Balance Sheet, and Equity in Income of Investments in Real Estate Partnerships, in the Consolidated Statements of Operations. Distributions received from these partnerships are accounted for using the look-through method with returns of capital from property sales or debt financing considered investing cash flows and the remaining distributions generally considered operating cash flows.

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 these partnerships can only be settled by the assets of these partnerships.

Reclassifications

During the six months ended June 30, 2016, the Company reclassified its land held for future development from Properties in development to Land within the accompanying Consolidated Balance Sheets. The Company reclassified prior period amounts of $47.3 million to conform to current period presentation.

Real Estate Investments

6 Months Ended

Jun. 30, 2016

Business Combinations [Abstract]

Real Estate Investments

The following table details the shopping centers acquired or land acquired for development during the six months ended June 30, 2016. There were no shopping centers or land acquired during the six months ended June 30, 2015.

(in thousands)

Six months ended June 30, 2016

Date Purchased

Property Name

City/State

Property Type

Ownership

Purchase Price

Intangible Assets

Intangible Liabilities

2/22/16

Garden City Park

Garden City Park, NY

Operating

100%

$17,300

10,171

2,940

3/4/16

The Market at Springwoods Village ⁽¹⁾

Houston, TX

Development

53%

17,994

—

5/16/16

Market Common Clarendon ⁽²⁾

Arlington, VA

Operating

100%

280,500

15,428

15,662

Total property acquisitions

$315,794

25,599

18,602

⁽¹⁾ Regency acquired a 53% controlling interest in the Market at Springwoods Village partnership to develop a shopping center on land contributed by the partner. As a result of consolidation, the Company recorded the partner's non-controlling interest of $8.4 million.

⁽²⁾Market Common Clarendon is a mixed-use center containing retail, residential and office space, along with income producing parking garages. The residential component is owned by a third party who contributes its share of the costs to maintain common areas.

The results of operations from the acquisition of Market Common Clarendon are included in the Consolidated Statements of Operations beginning on the acquisition date and resulted in the following impact to Revenues and Net income attributable to common stockholders for the three and six months ended June 30, 2016, as follows:



	June 30, 2016
(in thousands)	Three months ended		Six months ended
Increase in total revenues	$	2,287	2,287
Decrease in net income attributable to common stockholders ⁽¹⁾	1,299		1,619

⁽¹⁾ Includes $1.1 million and $1.4 million of transaction costs during the three and six months ended June 30, 2016, respectively, which are recorded in Other operating expenses in the accompanying Consolidated Statements of Operations.

The following unaudited pro forma financial data includes the incremental revenues, operating expenses, depreciation and amortization, and costs of financing the Market Common Clarendon acquisition as if it had occurred on January 1, 2015:



		(Pro Forma)			(Pro Forma)
		Three months ended June 30,			Six months ended June 30,
(in thousands, except per share data)		2016		2015	2016	2015
Total revenues		$	155,285	146,091	309,794	291,365
Income from operations	⁽¹⁾	42,290		33,718	84,210	63,545
Net income attributable to common stockholders	⁽¹⁾	37,004		33,575	86,093	58,388
Income per common share - basic		$	0.37	0.35	0.87	0.61
Income per common share - diluted		0.37		0.35	0.86	0.61

⁽¹⁾ The pro forma earnings for the three and six months ended June 30, 2016 were adjusted to exclude $1.1 million and $1.4 million, respectively, of acquisition costs, while 2015 pro forma earnings were adjusted to include those costs during the first quarter of 2015.

The pro forma financial data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the results of operations for future periods.

The following table details the weighted average amortization and net accretion periods, in years, of the major classes of intangible assets and intangible liabilities arising from the Market Common Clarendon acquisition:



		Six months ended
(in years)		June 30, 2016
Assets:
In-place leases		7.4

Liabilities:
Acquired lease intangible liabilities		7.9

Property Dispositions

6 Months Ended

Jun. 30, 2016

Discontinued Operations and Disposal Groups [Abstract]

Property Dispositions

Dispositions

The following table provides a summary of shopping centers and land parcels disposed of:



	Three months ended June 30,						Six months ended June 30,
(in thousands)	2016			2015			2016			2015
Net proceeds from sale of real estate investments	$	4,384		$	22,968		$	38,705		$	26,382
Gain on sale of real estate	$	548		$	5,657		$	13,417		$	6,460
Provision for impairment	$	—		$	—		$	(1,666	)	—
Number of operating properties sold	1			1			4			2
Number of land parcels sold	5			—			10			—
Percent interest sold	100		%	100		%	100		%	100		%

Held for Sale

At June 30, 2016, the Company was under contract to sell three operating properties. The assets associated with these properties have been classified as Properties held for sale in the accompanying Consolidated Balance Sheets.

- Definition

The entire disclosure 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=51719941&loc=SL51724579-110230

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721663-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721659-107760

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721671-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721677-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1474-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721683-107760

+ Details

Available-for-sale securities

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

Available-for-Sale Securities

Available-for-sale securities consist of investments held by the Company's wholly-owned captive insurance subsidiary, which is required to maintain statutory minimum capital and surplus; therefore its access to these securities may be limited. Available-for-sale securities are included in other assets in the accompanying Consolidated Balance Sheets.



	June 30, 2016
(in thousands)	Amortized Cost		Gains in Accumulated Other Comprehensive Loss	Losses in Accumulated Other Comprehensive Loss		Estimated Fair Value
Certificates of deposit	$	250	8	—		258
Corporate bonds	7,746		—	(14	)	7,732
Total	$	7,996	8	(14	)	7,990


(in thousands)	December 31, 2015
	Amortized Cost		Gains in Accumulated Other Comprehensive Loss	Losses in Accumulated Other Comprehensive Loss		Estimated Fair Value
Certificates of deposit	$	1,500	1	—		1,501
Corporate bonds	6,465		—	(44	)	6,421
	$	7,965	1	(44	)	7,922

Realized gains or losses on investments are recorded in the Company's consolidated statements of operations within net investment income. Upon the sale of a security classified as available-for-sale prior to its maturity, the security’s specific unrealized gain (loss) is reclassified out of accumulated other comprehensive loss into earnings. During the six months ended June 30, 2016 and 2015, there were no such reclassifications from accumulated other comprehensive loss into earnings.

The contractual maturities of available-for-sale securities were as follows:



	June 30, 2016
(in thousands)	Less than 12 months		1-3 Years	Over 3 Years	Total
Certificates of deposit	$	—	—	258	258
Corporate bonds	1,004		4,881	1,847	7,732
Total	$	1,004	4,881	2,105	7,990

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Notes Payable and Unsecured Credit Facilities

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Notes Payable and Unsecured Credit Facilities

The Company’s outstanding debt consisted of the following:



(in thousands)	June 30, 2016			December 31, 2015
Notes payable:
Fixed rate mortgage loans	$	429,273		475,214
Variable rate mortgage loans	54,154		⁽¹⁾	34,154
Fixed rate unsecured loans	1,191,204			1,190,403
Total notes payable	1,674,631			1,699,771
Unsecured credit facilities:
Line of Credit (the "Line")	145,000			—
Term Loan	164,585			164,514
Total unsecured credit facilities	309,585			164,514
Total debt outstanding	$	1,984,216		1,864,285

⁽¹⁾ As of June 30, 2016, the amount consists of two mortgages with variable interest rates of one month LIBOR plus 150 basis points and which mature on October 16, 2020 and April 1, 2023, respectively. Interest rate swaps are in place fixing the interest rates at 3.696% on $28.1 million and 2.803% on $20.0 million, respectively, of these two variable rate mortgages. See note 5.

As of June 30, 2016 , the key interest rates of the Company's notes payables and credit facilities were as follows:



	June 30, 2016
	Weighted Average Effective Rate		Weighted Average Contractual Rate
Mortgage loans	6.1%		6.1%
Fixed rate unsecured loans	5.5%		4.8%
Unsecured credit facilities	1.5%	⁽¹⁾	1.4%

⁽¹⁾Weighted average effective rate for the unsecured credit facilities is calculated based on a fully drawn Line balance.

Significant financing activity since December 31, 2015 includes the following:


•	The Company has repaid three mortgages totaling $41.6 million that were scheduled to mature during 2016.


•	The Company issued new variable rate mortgage debt of $20.0 million, related to one of the mortgages that matured during 2016.


•	The Company borrowed on the Line to fund its acquisition of Market Common Clarendon during the three months ended June 30, 2016.

Financing - Subsequent Events

•

Subsequent to June 30, 2016, the Company amended its existing Term Loan, which increased the facility size by $100.0 million to $265.0 million, extended the maturity date to January 5, 2022 and reduced the applicable interest rate. The Term Loan now bears interest at LIBOR plus a ratings based margin of 0.95% per annum, subject to adjustment from time to time based on changes to the Company's corporate credit rating. At closing, the Company executed interest rate swaps for the full notional amount of the Term Loan, which fixed the interest rate at 2.0% through maturity. Proceeds from the expanded Term Loan facility were used to repay part of the Line balance.


•	Subsequent to June 30, 2016, the Company provided 30 days notice to redeem the entirety of its $300 million of 5.875% senior unsecured notes due June 15, 2017 funded from proceeds from an equity offering, as discussed in note 7. The redemption will include a $13.2 million make-whole premium, which will be paid and expensed in August 2016.

As of June 30, 2016, scheduled principal payments and maturities on notes payable were as follows:



(in thousands)	June 30, 2016
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities	Unsecured Maturities ⁽¹⁾			Total
2016	$	2,963	—	—			2,963
2017	5,778		117,298	300,000		⁽²⁾	423,076
2018	5,103		57,358	—			62,461
2019	4,393		106,000	310,000		⁽³⁾	420,393
2020	4,349		84,011	150,000			238,360
Beyond 5 Years	13,184		76,792	750,000			839,976
Unamortized debt premium/(discount) and issuance costs	—		6,198	(9,211	)		(3,013	)
Total	$	35,770	447,657	1,500,789			1,984,216

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

⁽²⁾ The 2017 unsecured debt will be redeemed in August 2016 with proceeds from an equity offering.

⁽³⁾ In July 2016, the Term Loan was amended to mature in January 2022.

The Company was in compliance as of June 30, 2016 with the financial and other covenants under its unsecured public debt and unsecured credit facilities.

Derivatives

6 Months Ended

Jun. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial 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)								Liabilities ⁽²⁾
Effective Date	Maturity Date	Early Termination Date ⁽¹⁾	Notional Amount		Bank Pays Variable Rate of	Regency Pays Fixed Rate of		June 30, 2016			December 31, 2015
10/16/13	10/16/20	N/A	$	28,100	1 Month LIBOR	2.196%		$	(1,643	)	(898	)
4/7/16	4/1/23	N/A	20,000		1 Month LIBOR	1.303%		(383		)	—
6/15/17	6/15/27	12/15/17	20,000		3 Month LIBOR	3.488%	⁽³⁾	(3,746		)	(1,798	)
6/15/17	6/15/27	12/15/17	100,000		3 Month LIBOR	3.480%	⁽³⁾	(18,660		)	(8,922	)
6/15/17	6/15/27	12/15/17	100,000		3 Month LIBOR	3.480%	⁽³⁾	(18,660		)	(8,921	)
Total derivative financial instruments								$	(43,092	)	(20,539	)

⁽¹⁾ Represents the date specified in the agreement for either optional or mandatory early termination by the counterparty, which will result in cash settlement. The Company has the option to terminate and settle at any date prior to this.

⁽²⁾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.

⁽³⁾ In 2014, the Company entered into $220 million of forward starting interest rate swaps to hedge the interest rate on new fixed rate ten year debt that the Company expected to issue in June 2017 for the specific purpose of repaying at maturity the $300 million of 5.875% senior unsecured notes due June 15, 2017. These interest rate swaps locked in a weighted average fixed rate of 3.48%, before the Company's credit spread. These swaps were settled subsequent to June 30, 2016, as further described below.

These derivative financial instruments are all interest rate swaps, which are designated and qualify as cash flow hedges. The Company does not use derivatives for trading or speculative purposes and, as of June 30, 2016, 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 effective portion of 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 ineffective portion of the change in fair value of the derivatives is recognized directly in earnings within Interest expense, in the accompanying Consolidated Statements of Operations.

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



Derivatives in FASB ASC Topic 815 Cash Flow Hedging Relationships:	Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)				Location and Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location and Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Three months ended June 30,					Three months ended June 30,						Three months ended June 30,
(in thousands)	2016			2015		2016			2015			2016		2015
Interest rate swaps	$	(9,846	)	18,376	Interest expense	$	(2,500	)	(2,250	)	Other expenses	$	—	—

Derivatives in FASB ASC Topic 815 Cash Flow Hedging Relationships:	Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)				Location and Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location and Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Six months ended June 30,					Six months ended June 30,						Six months ended June 30,
(in thousands)	2016			2015		2016			2015			2016		2015
Interest rate swaps	$	(26,631	)	4,494	Interest expense	$	(4,952	)	(4,500	)	Other expenses	$	—	—

As of June 30, 2016, the Company expects $10.0 million of net deferred losses on derivative instruments accumulated in Other comprehensive income to be reclassified into earnings during the next 12 months, of which $8.4 million is related to previously settled swaps.

Hedge Settlement - Subsequent Event

Subsequent to June 30, 2016, the Company initiated and completed a $400 million equity offering, as further described in note 7, for the primary purpose of funding the early redemption of $300 million of 5.875% senior unsecured notes due on June 15, 2017. The Company also used $40.6 million from the net offering proceeds to settle $220 million of forward starting swaps related to new debt expected to be issue in 2017 to repay the notes at maturity. As a result of the equity offering, the Company now believes that the issuance of new fixed rate debt within the remaining period of the forward starting swaps is probable not to occur. Accordingly, the Company will cease hedge accounting and reclassify the amount paid to settle the forward starting swaps from Accumulated other comprehensive loss to earnings during the third quarter of 2016.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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+ Details

Fair Value Measurements

6 Months Ended

Jun. 30, 2016

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:



	June 30, 2016			December 31, 2015
(in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial assets:
Notes receivable	$	10,480	10,500	$	10,480	10,620
Financial liabilities:
Notes payable	$	1,674,631	1,796,400	$	1,699,771	1,793,200
Unsecured credit facilities	$	309,585	309,800	$	164,514	165,300

The above fair values represent management's estimate of the amounts that would be received from selling those assets or that would be paid to transfer those liabilities in an orderly transaction between market participants as of June 30, 2016 and December 31, 2015. 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, appropriately 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.

The following methods and assumptions were used to estimate the fair value of these financial instruments:

Notes Receivable

The fair value of the Company's Notes receivable is estimated by calculating the present value of future contractual cash flows discounted at interest rates available for notes of the same terms and maturities, adjusted for counter-party specific credit risk. The fair value of Notes receivable was determined primarily using Level 3 inputs of the fair value hierarchy, which considered counter-party credit risk and collateral risk of the underlying property securing the note receivable.

Notes Payable

The fair value of the Company's unsecured debt is estimated based on the quoted market prices for the same or similar issues or on the current rates offered to the Company for debt of the same remaining maturities. The fair value of the unsecured debt was determined using Level 2 inputs of the fair value hierarchy.

The fair value of the Company's mortgage notes payable is estimated by discounting future cash flows of each instrument at rates that reflect the current market rates available to the Company for debt of the same terms and maturities. Fixed rate loans assumed in connection with real estate acquisitions are recorded in the accompanying consolidated financial statements at fair value at the time the property is acquired. The fair value of the mortgage notes payable was determined using Level 2 inputs of the fair value hierarchy.

Unsecured Credit Facilities

The fair value of the Company's Unsecured credit facilities is estimated based on the interest rates currently offered to the Company by financial institutions. The fair value of the credit facilities was determined using Level 2 inputs of the fair value hierarchy.

The following interest rate ranges were used by the Company to estimate the fair value of its financial instruments:



	June 30, 2016		December 31, 2015
	Low	High	Low	High
Notes receivable	6.7%	6.7%	6.3%	6.3%
Notes payable	2.5%	3.5%	2.8%	4.2%
Unsecured credit facilities	1.4%	1.4%	1.1%	1.1%

(b) Fair Value Measurements

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

Trading Securities Held in Trust

The Company has investments in marketable securities, which are assets of the non-qualified deferred compensation plan ("NQDCP"), that are classified as trading securities held in trust on the accompanying Consolidated Balance Sheets. The fair value of the Trading securities held in trust was determined using quoted prices in active markets, which are considered Level 1 inputs of the fair value hierarchy. Changes in the value of trading securities are recorded within net investment (income) loss from deferred compensation plan in the accompanying Consolidated Statements of Operations.

Available-for-Sale Securities

Available-for-sale 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 securities are recognized through Other comprehensive income.

Interest Rate Derivatives

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

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

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



	Fair Value Measurements as of June 30, 2016
(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)
Trading securities held in trust	$	29,939		29,939	—		—
Available-for-sale securities	7,990			—	7,990		—
Total	$	37,929		29,939	7,990		—

Liabilities:
Interest rate derivatives	$	(43,092	)	—	(43,092	)	—



	Fair Value Measurements as of December 31, 2015
(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)
Trading securities held in trust	$	29,093		29,093	—		—
Available-for-sale securities	7,922			—	7,922		—
Total	$	37,015		29,093	7,922		—

Liabilities:
Interest rate derivatives	$	(20,539	)	—	(20,539	)	—

There were no assets measured at fair value on a nonrecurring basis as of June 30, 2016 or December 31, 2015.

- Definition

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

+ References + Details

Equity and Capital

6 Months Ended

Jun. 30, 2016

Equity and Capital [Abstract]

Equity and Capital

Common Stock of the Parent Company

Issuances:

At the Market ("ATM") Program

The current ATM equity offering program authorizes the Parent Company to sell up to $200 million of common stock at prices determined by the market at the time of sale. As of June 30, 2016, $70.8 million of common stock remained available for issuance under this ATM equity program.

There were no shares issued under the ATM equity program during the three months ended June 30, 2016 or 2015. The following table presents the shares that were issued under the ATM equity program during the six months ended June 30, 2016 and 2015:



	Six months ended June 30,
(dollar amounts are in thousands, except price per share data)	2016		2015
Shares issued ⁽¹⁾	182,787		18,125
Weighted average price per share	$	68.85	64.72
Gross proceeds	$	12,584	1,173
Commissions	$	157	15
⁽¹⁾ Reflects shares traded in December and settled in January each year.

Forward Equity Offering

In March 2016, the Parent Company entered into a forward sale agreement (the "Forward Equity Offering") with respect to 3.10 million shares of its common stock at an offering price of $75.25 per share before any underwriting discount and offering expenses.

In June 2016, the Parent Company partially settled its forward equity offering by delivering 1.85 million shares of newly issued common stock, receiving $137.5 million of net proceeds, which were used to repay the Line balance created from the acquisition of Market Common Clarendon.

The remaining 1.25 million shares may be settled under the forward sale agreement prior to June 23, 2017.

Equity Offering - Subsequent Event

Subsequent to June 30, 2016, the Parent Company issued 5.0 million shares of common stock at $79.78 per share resulting in net proceeds of $400.1 million, used to (i) redeem, in August, the entire $300 million of 5.875% senior unsecured notes due June 15, 2017, including a make-whole payment, (ii) settle forward interest rate swaps, and (iii) fund investment activities, and for general corporate purposes. The Parent Company agreed to a 60 day lock-up period, whereby it will not sell any shares of its common stock or any other derived form of transferring ownership of the company, except with respect to the 1.25 million shares that may be settled under the forward equity offering.

Common Units of the Operating Partnership

Issuances:

Common units were issued to the Parent Company in relation to the Parent Company's issuance of common stock, as discussed above.

Accumulated Other Comprehensive Loss

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



	Controlling Interest							Noncontrolling Interest					Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Securities		AOCI		Cash Flow Hedges		Unrealized gain (loss) on Available-For-Sale Securities	AOCI		AOCI
Balance as of December 31, 2014	$	(57,748	)	—		(57,748	)	(750	)	—	(750	)	(58,498	)
Other comprehensive income before reclassifications	4,558			(30	)	4,528		(64	)		(64	)	4,464
Amounts reclassified from accumulated other comprehensive income	4,421			—		4,421		79		—	79		4,500
Current period other comprehensive income, net	8,979			(30	)	8,949		15		—	15		8,964
Balance as of June 30, 2015	$	(48,769	)	(30	)	(48,799	)	(735	)	—	(735	)	(49,534	)

	Controlling Interest							Noncontrolling Interest					Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Securities		AOCI		Cash Flow Hedges		Unrealized gain (loss) on Available-For-Sale Securities	AOCI		AOCI
Balance as of December 31, 2015	$	(58,650	)	(43	)	(58,693	)	(785	)	—	(785	)	(59,478	)
Other comprehensive income before reclassifications	(26,256		)	37		(26,219	)	(375	)	—	(375	)	(26,594	)
Amounts reclassified from accumulated other comprehensive income	4,874			—		4,874		78		—	78		4,952
Current period other comprehensive income, net	(21,382		)	37		(21,345	)	(297	)	—	(297	)	(21,642	)
Balance as of June 30, 2016	$	(80,032	)	(6	)	(80,038	)	(1,082	)	—	(1,082	)	(81,120	)

The following represents amounts reclassified out of AOCI into income:



AOCI Component	Amount Reclassified from AOCI into income						Affected Line Item Where Net Income is Presented
	Three months ended June 30,			Six months ended June 30,
(in thousands)	2016		2015	2016		2015
Interest rate swaps	$	2,500	2,250	$	4,952	4,500	Interest expense

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6521494

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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company recorded stock-based compensation in General and administrative expenses in the accompanying Consolidated Statements of Operations. During 2016, the Company granted 191,128 shares of restricted stock with a weighted-average grant-date fair value of $79.40 per share.

Non-Qualified Deferred Compensation Plan

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [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 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 held in the Rabbi trust and the participant account obligations in the accompanying Consolidated Balance Sheets:



Non-Qualified Deferred Compensation Plan Component⁽¹⁾
(in thousands)	June 30, 2016		December 31, 2015
Assets:
Trading securities held in trust	$	29,939	29,093
Liabilities:
Accounts payable and other liabilities	$	29,500	28,632

⁽¹⁾The assets and liabilities presented include the trading securities held in the Rabbi trust and the related participant obligations. The Company's common stock held in the Rabbi trust, and the related participant obligation, is presented within Stockholders' equity in the accompanying Consolidated Balance Sheets as Treasury stock and part of Additional paid in capital, respectively.

Earnings per Share and Unit

6 Months Ended

Jun. 30, 2016

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 June 30,			Six months ended June 30,
(in thousands, except per share data)	2016		2015	2016		2015
Numerator:
Income from operations attributable to common stockholders - basic	$	34,810	32,480	$	82,687	57,653
Income from operations attributable to common stockholders - diluted	$	34,810	32,480	$	82,687	57,653
Denominator:
Weighted average common shares outstanding for basic EPS	97,657		94,136	97,588		94,036
Weighted average common shares outstanding for diluted EPS ⁽¹⁾	98,218		94,503	98,075		94,392

Income per common share – basic	$	0.36	0.35	$	0.85	0.61
Income per common share – diluted	$	0.35	0.34	$	0.84	0.61

⁽¹⁾ Includes the dilutive impact of unvested restricted stock and shares issuable under the forward equity offering 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 have no impact. Weighted average exchangeable Operating Partnership units outstanding for the three and six months ended June 30, 2016 and 2015 were 154,170.

Operating Partnership Earnings per Unit

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



	Three months ended June 30,			Six months ended June 30,
(in thousands, except per share data)	2016		2015	2016		2015
Numerator:
Income from operations attributable to common unit holders - basic	$	34,874	32,541	$	82,837	57,763
Income from operations attributable to common unit holders - diluted	$	34,874	32,541	$	82,837	57,763
Denominator:
Weighted average common units outstanding for basic EPU	97,811		94,290	97,742		94,190
Weighted average common units outstanding for diluted EPU ⁽¹⁾	98,372		94,658	98,229		94,546

Income per common unit – basic	$	0.36	0.35	$	0.85	0.61
Income per common unit – diluted	$	0.35	0.34	$	0.84	0.61

⁽¹⁾ Includes the dilutive impact of unvested restricted stock and forward equity offering using the treasury stock method.

Subsequent to June 30, 2016, the Parent Company issued 5.0 million shares of common stock pursuant to the Company's shelf registration statement. For details of the offering transaction, refer to Note 7.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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. 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 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. The Company has the right to issue letters of credit under the Line up to an amount not to exceed $50.0 million, which reduces the credit availability under the Line. These letters of credit are primarily issued as collateral on behalf of its captive insurance program and to facilitate the construction of development projects. As of June 30, 2016 and December 31, 2015, the Company had $5.8 million and $5.9 million, respectively, in letters of credit outstanding.

Organization and Principles of Consolidation (Policies)

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Reclassifications [Text Block]

Reclassifications

New Accounting Pronouncements and Changes in Accounting Principles [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:
ASU 2015-02, February 2015, Consolidation (Topic 810): Amendments to the Consolidation Analysis	ASU 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, and affects the consolidation analysis of reporting entities that are involved with VIEs.	January 2016	The adoption of this standard resulted in five additional investment partnerships being considered variable interest entities due to the limited partners' lack of substantive participation in the partnerships. This did not result in any impact to the Company's Consolidated Balance Sheets, Statements of Operations, or Cash Flows, but did result in additional disclosures about its relationships with and exposure to variable interest entities.

ASU 2015-03, April 2015, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs	ASU 2015-03 simplifies the presentation of debt issuance costs by requiring that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts.	January 2016	The adoption and implementation of this standard has resulted in the retrospective presentation of debt issuance costs associated with the Company's notes payable and term loans as a direct deduction from the carrying amount of the related debt instruments (previously, included in deferred costs in the consolidated balance sheets). Unamortized debt issuance costs of $8.2 million has been reclassified to offset the related debt as of December 31, 2015.

ASU 2015-15, August 2015, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements	ASU 2015-15 clarifies that debt issuance costs related to line-of-credit arrangements may be deferred and presented as an asset, amortized over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings.	January 2016	The adoption of this standard resulted in debt issuance costs related to the Line of credit ("Line") to continue being presented as an asset in the Consolidated Balance Sheets, previously within deferred costs, and now presented within other assets.



Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Not yet adopted:
ASU 2014-15, August 2014, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern	The standard requires management to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern, and to provide certain disclosures when it is probable that the entity will be unable to meet its obligations as they become due within one year after the date that the financial statements are issued.	December 2016	The Company does not expect the adoption of this standard to have an impact on its Consolidated Balance Sheets, Statements of Operations, or Cash Flows but will result in more disclosure surrounding the Company's plans around significant debt maturities.

ASU 2016-09, March 2016, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting	This ASU affects entities that issue share-based payment awards to their employees. The ASU is designed to simplify several aspects of accounting for share-based payment award transactions including income tax consequences, classification of awards as either equity or liabilities, an option to recognize stock compensation forfeitures as they occur, and changes to classification on the statement of cash flows.	January 2017	We are currently evaluating the alternative methods of adoption and the impact it may have on the Company's financial statements and related disclosures.

Revenue from Contracts with Customers (Topic 606): ASU 2014-09, May 2014, Revenue from Contracts with Customers (Topic 606) ASU 2016-08, March 2016, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ASU 2016-10, April 2016, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ASU 2016-12, May 2016, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients	The standard will replace existing revenue recognition standards and significantly expand the disclosure requirements for revenue arrangements. It may be adopted either retrospectively or on a modified retrospective basis to new contracts and existing contracts with remaining performance obligations as of the effective date.	January 2018	The Company is currently evaluating the alternative methods of adoption and the impact it may have on its financial statements and related disclosures.



Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
ASU 2016-01, January 2016, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The standard amends the guidance to classify equity securities with readily-determinable fair values into different categories and requires equity securities to be measured at fair value with changes in the fair value recognized through net income. Equity investments accounted for under the equity method are not included in the scope of this amendment. Early adoption of this amendment is not permitted.	January 2018	The Company does not expect the adoption and implementation of this standard to have a material impact on its results of operations, financial condition or cash flows.

ASU 2016-02, February 2016, Leases (Topic 842)	The standard 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, including a change to the treatment of initial direct leasing costs, which no longer considers fixed internal leasing salaries as capitalizable costs. Early adoption of this standard is permitted to coincide with adoption of ASU 2014-09. The standard requires 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.	January 2019	The Company is currently evaluating the alternative methods of adoption and the impact it will have on its financial statements and related disclosures.

ASU 2016-13, June 2016, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The amendments in this update replace 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.	January 2020	The Company is currently evaluating the alternative methods of adoption and the impact it will have on its financial statements and related disclosures.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

Real Estate Partnerships


•	Those partnerships for which the partners only have protective rights are considered VIEs under ASC 810, Consolidation. Regency is the primary beneficiary of these VIEs as Regency has power over these partnerships and they operate primarily for the benefit of Regency. As such, Regency consolidates these entities and reports the limited partners’ interest as noncontrolling interests.

The major classes of assets, liabilities, and non-controlling equity interests held by these VIEs are as follows:



(in thousands)	June 30, 2016		December 31, 2015
Assets	⁽¹⁾
Real estate assets, net	$	252,114	81,424
Cash and cash equivalents	10,822		790
Liabilities
Notes payable	17,578		17,948
Equity
Limited partners’ interests in consolidated partnerships	19,208		11,058


•	Those partnerships for which the partners are involved in the day to day decisions and do not have any other aspects that would cause them to be considered VIEs, are evaluated for consolidation using the voting interest model.


◦	Those partnerships which Regency has a controlling financial interest are consolidated and the limited partners’ ownership interest and share of net income is recorded as noncontrolling interest.

◦

Consolidation, Policy [Policy Text Block]

Consolidation

Ownership of the Operating Partnership

- Definition

Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).

+ References + Details

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

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-Name Accounting Standards Codification
-Topic 250
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-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

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-Subparagraph (SX 210.10-01.(b)(6))
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-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

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+ Details

Organization and Principles of Consolidation Variable Interest Entities (Tables)

6 Months Ended

Jun. 30, 2016

Variable Interest Entity [Line Items]

Schedule of Variable Interest Entities [Table Text Block]

The major classes of assets, liabilities, and non-controlling equity interests held by these VIEs are as follows:



(in thousands)	June 30, 2016		December 31, 2015
Assets	⁽¹⁾
Real estate assets, net	$	252,114	81,424
Cash and cash equivalents	10,822		790
Liabilities
Notes payable	17,578		17,948
Equity
Limited partners’ interests in consolidated partnerships	19,208		11,058

- Definition

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

+ References + Details

Organization and Principles of Consolidation Recent Accounting Pronouncements (Tables)

6 Months Ended

Jun. 30, 2016

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:
ASU 2015-02, February 2015, Consolidation (Topic 810): Amendments to the Consolidation Analysis	ASU 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 modifies the evaluation of whether limited partnerships and similar legal entities are VIEs or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, and affects the consolidation analysis of reporting entities that are involved with VIEs.	January 2016	The adoption of this standard resulted in five additional investment partnerships being considered variable interest entities due to the limited partners' lack of substantive participation in the partnerships. This did not result in any impact to the Company's Consolidated Balance Sheets, Statements of Operations, or Cash Flows, but did result in additional disclosures about its relationships with and exposure to variable interest entities.

ASU 2015-03, April 2015, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs	ASU 2015-03 simplifies the presentation of debt issuance costs by requiring that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts.	January 2016	The adoption and implementation of this standard has resulted in the retrospective presentation of debt issuance costs associated with the Company's notes payable and term loans as a direct deduction from the carrying amount of the related debt instruments (previously, included in deferred costs in the consolidated balance sheets). Unamortized debt issuance costs of $8.2 million has been reclassified to offset the related debt as of December 31, 2015.

ASU 2015-15, August 2015, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements	ASU 2015-15 clarifies that debt issuance costs related to line-of-credit arrangements may be deferred and presented as an asset, amortized over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings.	January 2016	The adoption of this standard resulted in debt issuance costs related to the Line of credit ("Line") to continue being presented as an asset in the Consolidated Balance Sheets, previously within deferred costs, and now presented within other assets.



Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
Not yet adopted:
ASU 2014-15, August 2014, Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern	The standard requires management to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern, and to provide certain disclosures when it is probable that the entity will be unable to meet its obligations as they become due within one year after the date that the financial statements are issued.	December 2016	The Company does not expect the adoption of this standard to have an impact on its Consolidated Balance Sheets, Statements of Operations, or Cash Flows but will result in more disclosure surrounding the Company's plans around significant debt maturities.

ASU 2016-09, March 2016, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting	This ASU affects entities that issue share-based payment awards to their employees. The ASU is designed to simplify several aspects of accounting for share-based payment award transactions including income tax consequences, classification of awards as either equity or liabilities, an option to recognize stock compensation forfeitures as they occur, and changes to classification on the statement of cash flows.	January 2017	We are currently evaluating the alternative methods of adoption and the impact it may have on the Company's financial statements and related disclosures.

Revenue from Contracts with Customers (Topic 606): ASU 2014-09, May 2014, Revenue from Contracts with Customers (Topic 606) ASU 2016-08, March 2016, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ASU 2016-10, April 2016, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ASU 2016-12, May 2016, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients	The standard will replace existing revenue recognition standards and significantly expand the disclosure requirements for revenue arrangements. It may be adopted either retrospectively or on a modified retrospective basis to new contracts and existing contracts with remaining performance obligations as of the effective date.	January 2018	The Company is currently evaluating the alternative methods of adoption and the impact it may have on its financial statements and related disclosures.



Standard	Description	Date of adoption	Effect on the financial statements or other significant matters
ASU 2016-01, January 2016, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities	The standard amends the guidance to classify equity securities with readily-determinable fair values into different categories and requires equity securities to be measured at fair value with changes in the fair value recognized through net income. Equity investments accounted for under the equity method are not included in the scope of this amendment. Early adoption of this amendment is not permitted.	January 2018	The Company does not expect the adoption and implementation of this standard to have a material impact on its results of operations, financial condition or cash flows.

ASU 2016-02, February 2016, Leases (Topic 842)	The standard 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, including a change to the treatment of initial direct leasing costs, which no longer considers fixed internal leasing salaries as capitalizable costs. Early adoption of this standard is permitted to coincide with adoption of ASU 2014-09. The standard requires 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.	January 2019	The Company is currently evaluating the alternative methods of adoption and the impact it will have on its financial statements and related disclosures.

ASU 2016-13, June 2016, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments	The amendments in this update replace 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.	January 2020	The Company is currently evaluating the alternative methods of adoption and the impact it will have on its financial statements and related disclosures.

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
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-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

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-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

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-Name Accounting Standards Codification
-Glossary Accounting Change
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 270
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

+ Details

Real Estate Investments (Tables)

6 Months Ended

Jun. 30, 2016

Business Combinations [Abstract]

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]



		Six months ended
(in years)		June 30, 2016
Assets:
In-place leases		7.4

Liabilities:
Acquired lease intangible liabilities		7.9

Business Acquisition, Pro Forma Information [Table Text Block]



	June 30, 2016
(in thousands)	Three months ended		Six months ended
Increase in total revenues	$	2,287	2,287
Decrease in net income attributable to common stockholders ⁽¹⁾	1,299		1,619



		(Pro Forma)			(Pro Forma)
		Three months ended June 30,			Six months ended June 30,
(in thousands, except per share data)		2016		2015	2016	2015
Total revenues		$	155,285	146,091	309,794	291,365
Income from operations	⁽¹⁾	42,290		33,718	84,210	63,545
Net income attributable to common stockholders	⁽¹⁾	37,004		33,575	86,093	58,388
Income per common share - basic		$	0.37	0.35	0.87	0.61
Income per common share - diluted		0.37		0.35	0.86	0.61

Schedule of business acquisitions

There were no shopping centers or land acquired during the six months ended June 30, 2015.

(in thousands)

Six months ended June 30, 2016

Date Purchased

Property Name

City/State

Property Type

Ownership

Purchase Price

Intangible Assets

Intangible Liabilities

2/22/16

Garden City Park

Garden City Park, NY

Operating

100%

$17,300

10,171

2,940

3/4/16

The Market at Springwoods Village ⁽¹⁾

Houston, TX

Development

53%

17,994

—

5/16/16

Market Common Clarendon ⁽²⁾

Arlington, VA

Operating

100%

280,500

15,428

15,662

Total property acquisitions

$315,794

25,599

18,602

⁽²⁾Market Common Clarendon is a mixed-use center containing retail, residential and office space, along with income producing parking garages. The residential component is owned by a third party

Property Dispositions (Tables)

6 Months Ended

Jun. 30, 2016

Discontinued Operations and Disposal Groups [Abstract]

Schedule of properties disposed of

The following table provides a summary of shopping centers and land parcels disposed of:



	Three months ended June 30,						Six months ended June 30,
(in thousands)	2016			2015			2016			2015
Net proceeds from sale of real estate investments	$	4,384		$	22,968		$	38,705		$	26,382
Gain on sale of real estate	$	548		$	5,657		$	13,417		$	6,460
Provision for impairment	$	—		$	—		$	(1,666	)	—
Number of operating properties sold	1			1			4			2
Number of land parcels sold	5			—			10			—
Percent interest sold	100		%	100		%	100		%	100		%

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759

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+ Details

Available-for-sale securities (Tables)

6 Months Ended

Jun. 30, 2016

Investments, Debt and Equity Securities [Abstract]

Investments Classified by Contractual Maturity Date [Table Text Block]

The contractual maturities of available-for-sale securities were as follows:



	June 30, 2016
(in thousands)	Less than 12 months		1-3 Years	Over 3 Years	Total
Certificates of deposit	$	—	—	258	258
Corporate bonds	1,004		4,881	1,847	7,732
Total	$	1,004	4,881	2,105	7,990

Available-for-sale Securities [Table Text Block]



	June 30, 2016
(in thousands)	Amortized Cost		Gains in Accumulated Other Comprehensive Loss	Losses in Accumulated Other Comprehensive Loss		Estimated Fair Value
Certificates of deposit	$	250	8	—		258
Corporate bonds	7,746		—	(14	)	7,732
Total	$	7,996	8	(14	)	7,990


(in thousands)	December 31, 2015
	Amortized Cost		Gains in Accumulated Other Comprehensive Loss	Losses in Accumulated Other Comprehensive Loss		Estimated Fair Value
Certificates of deposit	$	1,500	1	—		1,501
Corporate bonds	6,465		—	(44	)	6,421
	$	7,965	1	(44	)	7,922

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Notes Payable and Unsecured Credit Facilities (Tables)

6 Months Ended

Jun. 30, 2016

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The Company’s outstanding debt consisted of the following:



(in thousands)	June 30, 2016			December 31, 2015
Notes payable:
Fixed rate mortgage loans	$	429,273		475,214
Variable rate mortgage loans	54,154		⁽¹⁾	34,154
Fixed rate unsecured loans	1,191,204			1,190,403
Total notes payable	1,674,631			1,699,771
Unsecured credit facilities:
Line of Credit (the "Line")	145,000			—
Term Loan	164,585			164,514
Total unsecured credit facilities	309,585			164,514
Total debt outstanding	$	1,984,216		1,864,285

Schedule of long-term debt

As of June 30, 2016 , the key interest rates of the Company's notes payables and credit facilities were as follows:



	June 30, 2016
	Weighted Average Effective Rate		Weighted Average Contractual Rate
Mortgage loans	6.1%		6.1%
Fixed rate unsecured loans	5.5%		4.8%
Unsecured credit facilities	1.5%	⁽¹⁾	1.4%

⁽¹⁾Weighted average effective rate for the unsecured credit facilities is calculated based on a fully drawn Line balance.

Schedule of maturities of long-term debt

As of June 30, 2016, scheduled principal payments and maturities on notes payable were as follows:



(in thousands)	June 30, 2016
Scheduled Principal Payments and Maturities by Year:	Scheduled Principal Payments		Mortgage Loan Maturities	Unsecured Maturities ⁽¹⁾			Total
2016	$	2,963	—	—			2,963
2017	5,778		117,298	300,000		⁽²⁾	423,076
2018	5,103		57,358	—			62,461
2019	4,393		106,000	310,000		⁽³⁾	420,393
2020	4,349		84,011	150,000			238,360
Beyond 5 Years	13,184		76,792	750,000			839,976
Unamortized debt premium/(discount) and issuance costs	—		6,198	(9,211	)		(3,013	)
Total	$	35,770	447,657	1,500,789			1,984,216

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

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

Derivatives (Tables)

6 Months Ended

Jun. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments, Gain (Loss) [Table Text Block]

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



Derivatives in FASB ASC Topic 815 Cash Flow Hedging Relationships:	Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)				Location and Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location and Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Three months ended June 30,					Three months ended June 30,						Three months ended June 30,
(in thousands)	2016			2015		2016			2015			2016		2015
Interest rate swaps	$	(9,846	)	18,376	Interest expense	$	(2,500	)	(2,250	)	Other expenses	$	—	—

Derivatives in FASB ASC Topic 815 Cash Flow Hedging Relationships:	Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)				Location and Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location and Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Six months ended June 30,					Six months ended June 30,						Six months ended June 30,
(in thousands)	2016			2015		2016			2015			2016		2015
Interest rate swaps	$	(26,631	)	4,494	Interest expense	$	(4,952	)	(4,500	)	Other expenses	$	—	—

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)								Liabilities ⁽²⁾
Effective Date	Maturity Date	Early Termination Date ⁽¹⁾	Notional Amount		Bank Pays Variable Rate of	Regency Pays Fixed Rate of		June 30, 2016			December 31, 2015
10/16/13	10/16/20	N/A	$	28,100	1 Month LIBOR	2.196%		$	(1,643	)	(898	)
4/7/16	4/1/23	N/A	20,000		1 Month LIBOR	1.303%		(383		)	—
6/15/17	6/15/27	12/15/17	20,000		3 Month LIBOR	3.488%	⁽³⁾	(3,746		)	(1,798	)
6/15/17	6/15/27	12/15/17	100,000		3 Month LIBOR	3.480%	⁽³⁾	(18,660		)	(8,922	)
6/15/17	6/15/27	12/15/17	100,000		3 Month LIBOR	3.480%	⁽³⁾	(18,660		)	(8,921	)
Total derivative financial instruments								$	(43,092	)	(20,539	)

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Summary of balance sheet fair values



	June 30, 2016			December 31, 2015
(in thousands)	Carrying Amount		Fair Value	Carrying Amount		Fair Value
Financial assets:
Notes receivable	$	10,480	10,500	$	10,480	10,620
Financial liabilities:
Notes payable	$	1,674,631	1,796,400	$	1,699,771	1,793,200
Unsecured credit facilities	$	309,585	309,800	$	164,514	165,300

Fair Value, Interest rate ranges [Table Text Block]

The following interest rate ranges were used by the Company to estimate the fair value of its financial instruments:



	June 30, 2016		December 31, 2015
	Low	High	Low	High
Notes receivable	6.7%	6.7%	6.3%	6.3%
Notes payable	2.5%	3.5%	2.8%	4.2%
Unsecured credit facilities	1.4%	1.4%	1.1%	1.1%

Summary of assets measured on recurring basis

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



	Fair Value Measurements as of June 30, 2016
(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)
Trading securities held in trust	$	29,939		29,939	—		—
Available-for-sale securities	7,990			—	7,990		—
Total	$	37,929		29,939	7,990		—

Liabilities:
Interest rate derivatives	$	(43,092	)	—	(43,092	)	—



	Fair Value Measurements as of December 31, 2015
(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)
Trading securities held in trust	$	29,093		29,093	—		—
Available-for-sale securities	7,922			—	7,922		—
Total	$	37,015		29,093	7,922		—

Liabilities:
Interest rate derivatives	$	(20,539	)	—	(20,539	)	—

Equity and Capital (Tables)

6 Months Ended

Jun. 30, 2016

Equity and Capital [Abstract]

Summary of shares issued under ATM equity programs

The following table presents the shares that were issued under the ATM equity program during the six months ended June 30, 2016 and 2015:



	Six months ended June 30,
(dollar amounts are in thousands, except price per share data)	2016		2015
Shares issued ⁽¹⁾	182,787		18,125
Weighted average price per share	$	68.85	64.72
Gross proceeds	$	12,584	1,173
Commissions	$	157	15
⁽¹⁾ Reflects shares traded in December and settled in January each year.

Summary of accumulated other comprehensive loss

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



	Controlling Interest							Noncontrolling Interest					Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Securities		AOCI		Cash Flow Hedges		Unrealized gain (loss) on Available-For-Sale Securities	AOCI		AOCI
Balance as of December 31, 2014	$	(57,748	)	—		(57,748	)	(750	)	—	(750	)	(58,498	)
Other comprehensive income before reclassifications	4,558			(30	)	4,528		(64	)		(64	)	4,464
Amounts reclassified from accumulated other comprehensive income	4,421			—		4,421		79		—	79		4,500
Current period other comprehensive income, net	8,979			(30	)	8,949		15		—	15		8,964
Balance as of June 30, 2015	$	(48,769	)	(30	)	(48,799	)	(735	)	—	(735	)	(49,534	)

	Controlling Interest							Noncontrolling Interest					Total
(in thousands)	Cash Flow Hedges			Unrealized gain (loss) on Available-For-Sale Securities		AOCI		Cash Flow Hedges		Unrealized gain (loss) on Available-For-Sale Securities	AOCI		AOCI
Balance as of December 31, 2015	$	(58,650	)	(43	)	(58,693	)	(785	)	—	(785	)	(59,478	)
Other comprehensive income before reclassifications	(26,256		)	37		(26,219	)	(375	)	—	(375	)	(26,594	)
Amounts reclassified from accumulated other comprehensive income	4,874			—		4,874		78		—	78		4,952
Current period other comprehensive income, net	(21,382		)	37		(21,345	)	(297	)	—	(297	)	(21,642	)
Balance as of June 30, 2016	$	(80,032	)	(6	)	(80,038	)	(1,082	)	—	(1,082	)	(81,120	)

Schedule of amounts reclassified out of accumulated other comprehensive loss

The following represents amounts reclassified out of AOCI into income:



AOCI Component	Amount Reclassified from AOCI into income						Affected Line Item Where Net Income is Presented
	Three months ended June 30,			Six months ended June 30,
(in thousands)	2016		2015	2016		2015
Interest rate swaps	$	2,500	2,250	$	4,952	4,500	Interest expense

Non-Qualified Deferred Compensation Plan (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

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

The following table reflects the balances of the assets held in the Rabbi trust and the participant account obligations in the accompanying Consolidated Balance Sheets:



Non-Qualified Deferred Compensation Plan Component⁽¹⁾
(in thousands)	June 30, 2016		December 31, 2015
Assets:
Trading securities held in trust	$	29,939	29,093
Liabilities:
Accounts payable and other liabilities	$	29,500	28,632

Earnings per Share and Unit (Tables)

6 Months Ended

Jun. 30, 2016

Parent Company [Member]

Schedule of earnings per share

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



	Three months ended June 30,			Six months ended June 30,
(in thousands, except per share data)	2016		2015	2016		2015
Numerator:
Income from operations attributable to common stockholders - basic	$	34,810	32,480	$	82,687	57,653
Income from operations attributable to common stockholders - diluted	$	34,810	32,480	$	82,687	57,653
Denominator:
Weighted average common shares outstanding for basic EPS	97,657		94,136	97,588		94,036
Weighted average common shares outstanding for diluted EPS ⁽¹⁾	98,218		94,503	98,075		94,392

Income per common share – basic	$	0.36	0.35	$	0.85	0.61
Income per common share – diluted	$	0.35	0.34	$	0.84	0.61

Partnership Interest [Member]

Schedule of earnings per share

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



	Three months ended June 30,			Six months ended June 30,
(in thousands, except per share data)	2016		2015	2016		2015
Numerator:
Income from operations attributable to common unit holders - basic	$	34,874	32,541	$	82,837	57,763
Income from operations attributable to common unit holders - diluted	$	34,874	32,541	$	82,837	57,763
Denominator:
Weighted average common units outstanding for basic EPU	97,811		94,290	97,742		94,190
Weighted average common units outstanding for diluted EPU ⁽¹⁾	98,372		94,658	98,229		94,546

Income per common unit – basic	$	0.36	0.35	$	0.85	0.61
Income per common unit – diluted	$	0.35	0.34	$	0.84	0.61

⁽¹⁾ Includes the dilutive impact of unvested restricted stock and forward equity offering using the treasury stock method.

Organization and Principles of Consolidation (Details)	6 Months Ended
Organization and Principles of Consolidation (Details)	Jun. 30, 2016 retail_shopping_center
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
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	199
Unconsolidated Properties [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of real estate properties	112
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) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 17,578	$ 17,948
Noncontrolling Interest in Variable Interest Entity	19,208	11,058
Real Estate [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	252,114	81,424
Cash and Cash Equivalents [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	$ 10,822	$ 790

Organization and Principles of Consolidation Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
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	$ 7.8	$ 8.2

- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References + Details

Organization and Principles of Consolidation Reclassifications (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Reclassifications [Abstract]
Prior Period Reclassification Adjustment	$ 47.3

Real Estate Investments Business Acquisitions (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Document Period End Date		Jun. 30, 2016
Purchase Price		$ 315,794,000	$ 0
Market Common Clarendon [Member]
Business Acquisition [Line Items]
Date Purchased		May 16, 2016
Property Name		Market Common Clarendon (2)
City/State		Arlington, VA
Business Acquisition, Description of Acquired Entity		Operating
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	100.00%
Purchase Price		$ 280,500,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 2,287,000	$ 2,287,000
Garden City [Member]
Business Acquisition [Line Items]
Date Purchased		Feb. 22, 2016
Property Name		Garden City Park
City/State		Garden City Park, NY
Business Acquisition, Description of Acquired Entity		Operating
Business Acquisition, Percentage of Voting Interests Acquired	100.00%	100.00%
Purchase Price		$ 17,300,000
The Market at Springwoods Village [Member]
Business Acquisition [Line Items]
Date Purchased		Mar. 04, 2016
Property Name		The Market at Springwoods Village (1)
City/State		Houston, TX
Business Acquisition, Description of Acquired Entity		Development
Business Acquisition, Percentage of Voting Interests Acquired	53.00%	53.00%
Purchase Price		$ 17,994,000
Non-controlling interest recorded, fair value	$ 8,400,000	8,400,000
Parent Company [Member]
Business Acquisition [Line Items]
Contributions from limited partners in consolidated partnerships, net		8,420,000	13,000
Payments for Deposits on Real Estate Acquisitions		1,500,000	4,500,000
Partnership Interest [Member]
Business Acquisition [Line Items]
Contributions from limited partners in consolidated partnerships, net		8,420,000	13,000
Payments for Deposits on Real Estate Acquisitions		1,500,000	4,500,000
Non-controlling interest recorded, fair value	0	0	$ 0
Off-Market Favorable Lease [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	25,599,000	25,599,000
Off-Market Favorable Lease [Member] \| Market Common Clarendon [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	15,428,000	15,428,000
Off-Market Favorable Lease [Member] \| Garden City [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	10,171,000	10,171,000
Off-Market Favorable Lease [Member] \| The Market at Springwoods Village [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	0	0
Off-Market Lease, Unfavorable [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	18,602,000	18,602,000
Off-Market Lease, Unfavorable [Member] \| Market Common Clarendon [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	15,662,000	15,662,000
Off-Market Lease, Unfavorable [Member] \| Garden City [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	2,940,000	2,940,000
Off-Market Lease, Unfavorable [Member] \| The Market at Springwoods Village [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 0	$ 0

Real Estate Investments Business Acquisitions, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition, Pro Forma Information [Line Items]
Document Fiscal Year Focus			2016
Business Acquisition, Pro Forma Revenue	$ 155,285	$ 146,091	$ 309,794	$ 291,365
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax	42,290	33,718	84,210	63,545
Business Acquisition, Pro Forma Net Income (Loss)	$ 37,004	$ 33,575	$ 86,093	$ 58,388
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.0037	$ 0.0035	$ 0.0087	$ 0.0061
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.0037	$ 0.0035	$ 0.0086	$ 0.0061
Market Common Clarendon [Member]
Business Acquisition, Pro Forma Information [Line Items]
Business Combination, Transaction Costs	$ 1,100		$ 1,400
Business Combination, Pro Forma Information, Expenses of Acquiree since Acquisition Date, Actual	1,299		1,619
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 2,287		$ 2,287

Real Estate Investments Acquired Finite-Lived Intangibles Acquired as Part of a Business Combination (Details)	6 Months Ended
	Jun. 30, 2016
Acquired Lease Intangible Liabilities [Member] \| Parent Company [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Accretion Period of Intangible Liabilities	7 years 10 months 24 days

Property Dispositions (Details) $ in Thousands	3 Months Ended		6 Months Ended
Property Dispositions (Details) $ in Thousands	Jun. 30, 2016 USD ($) property	Jun. 30, 2015 USD ($) property	Jun. 30, 2016 USD ($) property	Jun. 30, 2015 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Document Period End Date			Jun. 30, 2016
Proceeds from sale of real estate investments	$ 4,384	$ 22,968	$ 38,705	$ 26,382
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	548	5,657	13,417	6,460
Provision for impairment	$ 0	$ 0	$ (1,666)	$ 0
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%	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			$ 36,751	$ 26,567
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	$ 548	$ 5,657	13,417	6,460
Revenues	152,412	141,129	302,041	281,528
Operating expenses	99,567	88,955	195,444	178,794
Provision for impairment	$ 0	$ 0	$ (1,666)	$ 0
Operating Segments [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of impaired operating properties			3
Number of Real Estate Properties Sold \| property	1	1	4	2
Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties Sold \| property	5	0	10	0

Available-for-sale securities (Details) $ in Thousands	6 Months Ended
Available-for-sale securities (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 7,996
Available-for-sale Securities	7,990
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(14)
Available-for-sale Securities, Equity & Debt Maturities, Next Rolling Twelve Months, Fair Value	1,004
Available-for-sale Securities, Equity & Debt Maturities, Rolling Year One Through Three, Fair Value	4,881
Available-for-sale Securities, Equity & Debt Maturities, Rolling After Year Three, Fair Value	2,105
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Maturities, Next Rolling Twelve Months, Fair Value	0
Available-for-sale Securities, Amortized Cost Basis	250
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	8
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	0
Available-for-sale Securities	258
Available-for-sale Securities, Equity Maturities, Rolling Year One Through Three, Fair Value	0
Available-for-sale Securities, Equity Maturities, Rolling After Year Three, Fair Value	258
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	7,746
Available-for-sale Securities	7,732
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(14)
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value	1,004
Available-for-sale Securities, Debt Maturities, Rolling Year One Through Three, Fair Value	4,881
Available-for-sale Securities, Debt Maturities, Rolling After Year Three, Fair Value	1,847
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	$ 0

Notes Payable and Unsecured Credit Facilities (Details) - USD ($) $ in Thousands			6 Months Ended
	Jan. 05, 2022	Jul. 07, 2016	Jun. 30, 2016	Jun. 30, 2015	Jul. 13, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Document Period End Date			Jun. 30, 2016
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			$ 2,963
2017			423,076
Long-term Debt, Maturities, Repayments of Principal in Year Three			62,461
2019			420,393
2020			238,360
Beyond 5 Years			839,976
Unamortized debt (discounts) premiums, net			(3,013)
Long-term Debt			1,984,216			$ 1,864,285
Mortgages [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt			429,273			475,214
Notes Payable to Banks [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt			1,674,631			1,699,771
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities			309,585			164,514
Maturities of Long-term Debt [Abstract]
Long-term Debt			1,191,204			1,190,403
Line of Credit [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities			145,000			0
Term Loan [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total credit facilities			164,585			164,514
Parent Company [Member]
Debt Instrument [Line Items]
Repayments of Notes Payable			$ 41,584	$ 76,027
Construction Loans [Member] \| Variable Income Interest Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms			one month LIBOR plus 150 basis points
Fellsway $28.1M, Swap fixed 3.696% [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			3.696%
Blackrock $20M, Swap fixed 2.803% [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			2.803%
Scheduled Principal Payments [Member] \| Mortgages [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			$ 2,963
2017			5,778
Long-term Debt, Maturities, Repayments of Principal in Year Three			5,103
2019			4,393
2020			4,349
Beyond 5 Years			13,184
Unamortized debt (discounts) premiums, net			0
Long-term Debt			35,770
Mortgage Loan Maturities [Member] \| Mortgages [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			0
2017			117,298
Long-term Debt, Maturities, Repayments of Principal in Year Three			57,358
2019			106,000
2020			84,011
Beyond 5 Years			76,792
Unamortized debt (discounts) premiums, net			6,198
Long-term Debt			447,657
Unsecured Maturities [Member] \| Unsecured Debt [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			0
2017			300,000
Long-term Debt, Maturities, Repayments of Principal in Year Three			0
2019			310,000
2020			150,000
Beyond 5 Years			750,000
Unamortized debt (discounts) premiums, net			(9,211)
Long-term Debt			1,500,789
Subsequent Event [Member] \| Unsecured Debt [Member]
Maturities of Long-term Debt [Abstract]
Debt Instrument, Interest Rate, Stated Percentage					5.875%
Notice of Repayment of Unsecured Debt Subsequent to Period End Date, Make-Whole Premium Costs					$ 13,200
Subsequent Event [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Increase in Borrowing Capacity		$ 100,000
Line of Credit Facility, Maximum Borrowing Capacity		$ 265,000
Line of Credit Facility, Expiration Date	Jan. 05, 2022
Line of Credit Facility, Interest Rate Description		LIBOR plus a ratings based margin of 0.95%
Line of Credit Facility, Interest Rate at Period End		2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt			20,000
Maturities of Long-term Debt [Abstract]
Long-term Debt			54,154			$ 34,154
Derivative @ 2.196% 28.1M [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount			28,100
Derivative @ 1.30250% 20.0M [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount			$ 20,000

Notes Payable and Unsecured Credit Facilities Weighted Average Debt Rates (Details)	Jun. 30, 2016
Effective Rate [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.50%
Effective Rate [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.50%
Effective Rate [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.10%
Contractual Rate [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.40%
Contractual Rate [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.80%
Contractual Rate [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.10%

Derivatives (Details) - USD ($)		3 Months Ended		6 Months Ended
Derivatives (Details) - USD ($)	Jul. 14, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 13, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		$ (9,846,000)	$ 18,376,000	$ (26,631,000)	$ 4,494,000
Amount reclassified from accumulated other comprehensive loss		(2,500,000)	(2,250,000)	(4,952,000)	(4,500,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		0	$ 0	0	$ 0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				10,000,000
Assets [Member]
Derivative [Line Items]
Derivative, Notional Amount		220,000,000		$ 220,000,000
Derivative @ 2.196% 28.1M [Member]
Derivative [Line Items]
Derivative, Inception Date				Oct. 16, 2013
Derivative, Maturity Date				Oct. 16, 2020
Derivative, Notional Amount		$ 28,100,000		$ 28,100,000
Derivative, Description of Variable Rate Basis				1 Month LIBOR
Derivative, Fixed Interest Rate		2.196%		2.196%
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (1,643,000)		$ (1,643,000)			$ (898,000)
Derivative @ 3.488% 20K [Member]
Derivative [Line Items]
Derivative, Inception Date				Jun. 15, 2017
Derivative, Maturity Date				Jun. 15, 2027
Derivative, Early Termination Date				Dec. 15, 2017
Derivative, Notional Amount		$ 20,000,000		$ 20,000,000
Derivative, Description of Variable Rate Basis				3 Month LIBOR
Derivative, Fixed Interest Rate		3.4875%		3.4875%
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (3,746,000)		$ (3,746,000)			(1,798,000)
Derivative @ 3.48% 100K [Member]
Derivative [Line Items]
Derivative, Inception Date				Jun. 15, 2017
Derivative, Maturity Date				Jun. 15, 2027
Derivative, Early Termination Date				Dec. 15, 2017
Derivative, Notional Amount		$ 100,000,000		$ 100,000,000
Derivative, Description of Variable Rate Basis				3 Month LIBOR
Derivative, Fixed Interest Rate		3.48%		3.48%
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (18,660,000)		$ (18,660,000)			(8,922,000)
Swap [Member]
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				$ 8,400,000
Derivative @ 3.48% 100K 2 [Member]
Derivative [Line Items]
Derivative, Inception Date				Jun. 15, 2017
Derivative, Maturity Date				Jun. 15, 2027
Derivative, Early Termination Date				Dec. 15, 2017
Derivative, Notional Amount		$ 100,000,000		$ 100,000,000
Derivative, Description of Variable Rate Basis				3 Month LIBOR
Derivative, Fixed Interest Rate		3.48%		3.48%
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (18,660,000)		$ (18,660,000)			(8,921,000)
Derivative @ 1.30250% 20.0M [Member]
Derivative [Line Items]
Derivative, Inception Date				Apr. 07, 2016
Derivative, Maturity Date				Apr. 01, 2023
Derivative, Notional Amount		$ 20,000,000		$ 20,000,000
Derivative, Description of Variable Rate Basis				1 Month LIBOR
Derivative, Fixed Interest Rate		1.3025%		1.3025%
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (383,000)		$ (383,000)			0
Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value		(43,092,000)		(43,092,000)			(20,539,000)
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value		$ (43,092,000)		$ (43,092,000)			$ (20,539,000)
2017 Debt issuance [Member] \| Derivative [Member]
Derivative [Line Items]
Derivative, Fixed Interest Rate		3.48%		3.48%
Subsequent Event [Member]
Derivative [Line Items]
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring	$ 40,600,000
Subsequent Event [Member] \| Unsecured Debt [Member]
Derivative [Line Items]
Notice of Repayment of Unsecured Debt, Subsequent to Period End Date						$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage						5.875%

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes receivable	$ 10,480		$ 10,480		$ 10,480
Notes payable	1,674,631		1,674,631		1,699,771
Unsecured credit facilities	309,585		309,585		164,514
Available-for-sale Securities	7,990		7,990
Provision for impairment	0	$ 0	(1,666)	$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	29,939		29,939		29,093
Available-for-sale Securities	7,990		7,990		7,922
Total	37,929		37,929		37,015
Derivative instruments, at fair value	(43,092)		(43,092)		(20,539)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities held in trust					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]
Trading Securities	29,939		29,939		29,093
Available-for-sale Securities	0		0		0
Total	29,939		29,939		29,093
Derivative instruments, at fair value	0		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	1,796,400		1,796,400		1,793,200
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0		0
Available-for-sale Securities	7,990		7,990		7,922
Total	7,990		7,990		7,922
Derivative instruments, at fair value	(43,092)		(43,092)		(20,539)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Receivable, Fair Value	10,500		10,500		10,620
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	0		0		0
Available-for-sale Securities	0		0		0
Total	0		0		0
Derivative instruments, at fair value	0		$ 0		$ 0
Unsecured Credit Facilities [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			1.40%		1.10%
Unsecured Credit Facilities [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			1.40%		1.10%
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	$ 309,800		$ 309,800		$ 165,300
Notes Payable, Other Payables [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			2.50%		2.80%
Notes Payable, Other Payables [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			3.50%		4.20%
Notes Receivable [Member] \| Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			6.70%		6.30%
Notes Receivable [Member] \| Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Risk Free Interest Rate			6.70%		6.30%

Equity and Capital Equity and Capital - Common Stock (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 15, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 13, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Document Period End Date				Jun. 30, 2016
Equity Issuances, Amount Available for Issuance		$ 70,800,000.0		$ 70,800,000.0
Long-term Debt, Maturities, Repayments of Principal in Year Two		423,076,000		423,076,000
Long-term Debt, Maturities, Repayments of Principal in Year Three		$ 62,461,000		$ 62,461,000
Maximum [Member]
Class of Stock [Line Items]
Equity Issuances, Common Shares Authorized for Issuance		200,000,000		200,000,000
Equity Offering, Common Shares Authorized for Issuance		3,100,000		3,100,000
Forward Equity Offering, Common Shares available for issue		1,250,000		1,250,000
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Class of Stock [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		$ 2,500,000	$ 2,250,000	$ 4,952,000	$ 4,500,000
Accumulated other comprehensive loss		$ (81,120,000)	(49,534,000)	$ (81,120,000)	(49,534,000)		$ (59,478,000)	$ (58,498,000)
Common Stock [Member]
Class of Stock [Line Items]
Forward Equity Offering, Agreement Price Per Share, Common Stock		$ 75.25		$ 75.25
Accumulated Other Comprehensive Income (Loss) [Member]
Class of Stock [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax				$ 4,874,000	4,421,000
Accumulated other comprehensive loss		$ (80,038,000)	$ (48,799,000)	$ (80,038,000)	$ (48,799,000)		$ (58,693,000)	$ (57,748,000)
ATM Equity Offering Program [Member]
Class of Stock [Line Items]
Shares issued				182,787	18,125
Weighted Average Price Per Share				$ 68.85	$ 64.72
Net proceeds from common stock issuance				$ 12,584,000	$ 1,173,000
Payments for Commissions				$ 157,000	$ 15,000
Forward Equity Offering [Member]
Class of Stock [Line Items]
Shares issued				1,850,000
Net proceeds from common stock issuance				$ 137,500,000
Equity Offering [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Shares issued	5,000,000
Shares Issued, Price Per Share	$ 79.78
Net proceeds from common stock issuance	$ 400,100,000
Unsecured Debt [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Notice of Repayment of Unsecured Debt, Subsequent to Period End Date						$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage						5.875%

Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			$ (26,256)	$ 4,558
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(58,650)	(57,748)
Current period other comprehensive income, net			(21,382)	8,979
Ending balance	$ (80,032)	$ (48,769)	(80,032)	(48,769)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			4,874	4,421
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			0	0
Current period other comprehensive income, net			0	0
Ending balance	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(375)	(64)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(785)	(750)
Current period other comprehensive income, net			(297)	15
Ending balance	(1,082)	(735)	(1,082)	(735)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			78	79
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(26,594)	4,464
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(59,478)	(58,498)
Current period other comprehensive income, net			(21,642)	8,964
Ending balance	(81,120)	(49,534)	(81,120)	(49,534)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,500	2,250	4,952	4,500
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			37	(30)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(43)	0
Current period other comprehensive income, net			37	(30)
Ending balance	(6)	(30)	(6)	(30)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(26,219)	4,528
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(58,693)	(57,748)
Current period other comprehensive income, net			(21,345)	8,949
Ending balance	(80,038)	(48,799)	(80,038)	(48,799)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			4,874	4,421
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(375)	(64)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(785)	(750)
Current period other comprehensive income, net			(297)	15
Ending balance	(1,082)	(735)	(1,082)	(735)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			78	79
Partnership Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(58,693)
Current period other comprehensive income, net	(7,273)	$ 20,596	(21,642)	8,964
Ending balance	$ (80,038)		(80,038)
Partnership Interest [Member] \| General Partner [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Current period other comprehensive income, net			0	0
Partnership Interest [Member] \| Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Current period other comprehensive income, net			$ (21,345)	$ 8,949

Stock-Based Compensation (Details) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted \| shares	191,128
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 79.40

Non-Qualified Deferred Compensation Plan (Details) - Parent Company [Member] - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred Compensation Plan Assets	$ 29,939	$ 29,093
Deferred Compensation Liability, Current and Noncurrent	$ 29,500	$ 28,632

Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 15, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income per common unit - diluted
Weighted Average Limited Partnership Units Outstanding, Basic		154,170,000		154,170
Parent Company [Member]
Earnings Per Share [Abstract]
Income from operations		$ 40,096	$ 32,623	$ 80,804	$ 62,811
Gain on sale of real estate				13,417	6,460
Net income attributable to common stockholders		$ 34,810	$ 32,480	$ 82,687	$ 57,653
Weighted average common units outstanding for basic EPU (in shares)		97,657,000	94,136,000	97,588,000	94,036,000
Weighted average common units outstanding for diluted EPU (in shares)		98,218,000	94,503,000	98,075,000	94,392,000
Income per common share/unit - basic:
Continuing operations (in dollars per share)		$ 0.36	$ 0.35	$ 0.85	$ 0.61
Income per common share/unit - diluted:
Continuing operations (in dollars per share)		$ 0.35	$ 0.34	$ 0.84	$ 0.61
Partnership Interest [Member]
Earnings Per Share [Abstract]
Income from operations		$ 40,096	$ 32,623	$ 80,804	$ 62,811
Gain on sale of real estate				$ 13,417	$ 6,460
Weighted average common units outstanding for basic EPU (in shares)		97,811,000	94,290,000	97,742,000	94,190,000
Weighted average common units outstanding for diluted EPU (in shares)		98,372,000	94,658,000	98,229,000	94,546,000
Income per common unit - basic
Continuing operations (in dollars per share)		$ 0.36	$ 0.35	$ 0.85	$ 0.61
Income per common unit - diluted
Continuing operations (in dollars per share)		$ 0.35	$ 0.34	$ 0.84	$ 0.61
Continuing Operations [Member] \| Parent Company [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders		$ 34,810	$ 32,480	$ 82,687	$ 57,653
Net income for common stock unit/holders - diluted		34,810	32,480	82,687	57,653
Continuing Operations [Member] \| Partnership Interest [Member]
Earnings Per Share [Abstract]
Net income attributable to common stockholders		34,874	32,541	82,837	57,763
Net income for common stock unit/holders - diluted		$ 34,874	$ 32,541	$ 82,837	$ 57,763
Equity Offering [Member] \| Subsequent Event [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Stock Issued During Period, Shares, New Issues	5,000,000

Commitments and Contingencies, Letters of Credit (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000,000
Letters of Credit Outstanding, Amount	$ 5,800,000	$ 5,900,000

Label	Element	Value
Leases, Acquired-in-Place [Member] \| Parent Company [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	7 years 4 months 24 days