CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Earnings Less than Distributions [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interest [Member] Consolidated Joint Ventures [Member]	Noncontrolling Interest [Member] Consolidated Real Estate Fund [Member]	Noncontrolling Interest [Member] Operating Partnership [Member]
Beginning balance at Dec. 31, 2018	$ 4,891,664	$ 2,329	$ 4,201,756	$ (219,906)	$ 16,621	$ 394,995	$ 66,887	$ 428,982
Common stock, shares outstanding at Dec. 31, 2018		233,136,000
Net (loss) income	12,174			6,164		5,202	147	661
Common shares issued upon redemption of common units		$ 14	23,976
Common shares issued upon redemption of common units		1,406,000
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(307)	$ 3		(310)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		56,000
Repurchases of common shares	(6,488)	$ (5)	(6,483)
Repurchases of common shares, shares		(474,000)
Dividends and distributions	(51,902)			(46,887)				(5,015)
Contributions from noncontrolling interests	14,966						14,966
Distributions to noncontrolling interests	(34,919)					(34,919)
Change in value of interest rate swaps	(24,371)				(22,026)			(2,345)
Pro rata share of other comprehensive loss of unconsolidated joint ventures	(184)				(120)		(51)	(13)
Amortization of equity awards	12,756		1,340					11,416
Reallocation of noncontrolling interest			(6,396)					6,396
Ending balance at Jun. 30, 2019	4,813,389	$ 2,341	4,214,193	(260,939)	(5,525)	365,278	81,949	416,092
Common stock, shares outstanding at Jun. 30, 2019		234,124,000
Redemption of minority interest in operating partnerships								(23,990)
Beginning balance at Mar. 31, 2019	4,854,636	$ 2,345	4,218,060	(239,949)	8,421	367,012	81,434	417,313
Common stock, shares outstanding at Mar. 31, 2019		234,478,000
Net (loss) income	5,174			2,455		2,408	53	258
Common shares issued upon redemption of common units		$ 1	2,007
Common shares issued upon redemption of common units		118,000
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(6)			(6)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		2,000
Repurchases of common shares	(6,488)	$ (5)	(6,483)
Repurchases of common shares, shares		(474,000)
Dividends and distributions	(25,953)			(23,439)				(2,514)
Contributions from noncontrolling interests	470						470
Distributions to noncontrolling interests	(4,142)					(4,142)
Change in value of interest rate swaps	(15,345)				(13,884)			(1,461)
Pro rata share of other comprehensive loss of unconsolidated joint ventures	(76)				(62)		(8)	(6)
Amortization of equity awards	5,119		643					4,476
Reallocation of noncontrolling interest			(34)					34
Ending balance at Jun. 30, 2019	4,813,389	$ 2,341	4,214,193	(260,939)	(5,525)	365,278	81,949	416,092
Common stock, shares outstanding at Jun. 30, 2019		234,124,000
Redemption of minority interest in operating partnerships								(2,008)
Beginning balance at Dec. 31, 2019	$ 4,630,962	$ 2,274	4,133,184	(349,557)	(171)	360,778	72,396	412,058
Common stock, shares outstanding at Dec. 31, 2019	227,432,030	227,432,000
Repurchases of common shares	$ (100,000)
Repurchases of common shares, shares		(10,856,865)
Ending balance at Mar. 31, 2020	4,507,192	$ 2,219	4,102,287	(368,767)	(13,478)	359,120	80,476	345,335
Common stock, shares outstanding at Mar. 31, 2020		221,750,000
Beginning balance at Dec. 31, 2019	$ 4,630,962	$ 2,274	4,133,184	(349,557)	(171)	360,778	72,396	412,058
Common stock, shares outstanding at Dec. 31, 2019	227,432,030	227,432,000
Net (loss) income	$ (2,458)			(2,922)		1,919	(1,212)	(243)
Common shares issued upon redemption of common units		$ 51	85,260
Common shares issued upon redemption of common units		5,126,000
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(316)	$ 3		(319)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		63,000
Repurchases of common shares	(100,000)	$ (109)	(99,891)
Repurchases of common shares, shares		(10,857,000)
Dividends and distributions	(48,634)			(44,422)				(4,212)
Contributions from noncontrolling interests	11,555					3,500	8,055
Distributions to noncontrolling interests	(6,357)					(6,357)
Pro rata share of other comprehensive loss of unconsolidated joint ventures	(16,357)				(14,860)		4	(1,501)
Amortization of equity awards	9,708		692					9,016
Reallocation of noncontrolling interest			(18,933)					18,933
Sale of a 10.0% interest in 1633 Broadway	109,573		33,230			76,343
Ending balance at Jun. 30, 2020	$ 4,587,676	$ 2,219	4,133,542	(397,220)	(15,031)	436,183	79,243	348,740
Common stock, shares outstanding at Jun. 30, 2020	221,763,687	221,764,000
Redemption of minority interest in operating partnerships								(85,311)
Beginning balance at Mar. 31, 2020	$ 4,507,192	$ 2,219	4,102,287	(368,767)	(13,478)	359,120	80,476	345,335
Common stock, shares outstanding at Mar. 31, 2020		221,750,000
Net (loss) income	(7,684)			(6,270)		405	(1,235)	(584)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(7)			(7)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		14,000
Repurchases of common shares, shares		0
Dividends and distributions	(24,292)			(22,176)				(2,116)
Contributions from noncontrolling interests	3,500					3,500
Distributions to noncontrolling interests	(3,185)					(3,185)
Pro rata share of other comprehensive loss of unconsolidated joint ventures	(1,696)				(1,553)		2	(145)
Amortization of equity awards	4,275		294					3,981
Reallocation of noncontrolling interest			(2,269)					2,269
Sale of a 10.0% interest in 1633 Broadway	109,573		33,230			76,343
Ending balance at Jun. 30, 2020	$ 4,587,676	$ 2,219	$ 4,133,542	$ (397,220)	$ (15,031)	$ 436,183	$ 79,243	$ 348,740
Common stock, shares outstanding at Jun. 30, 2020	221,763,687	221,764,000