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, 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		227,432,000
Net loss	(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
Redemption of minority interest in operating partnerships								(85,311)
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		(10,856,865)
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 income (loss) of unconsolidated joint ventures	(16,357)				(14,860)		4	(1,501)
Amortization of equity awards	9,708		692					9,016
Sale of a 10.0% interest in 1633 Broadway	109,573		33,230			76,343
Reallocation of noncontrolling interest			(18,933)					18,933
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		221,764,000
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		227,432,000
Repurchases of common shares	(120,000)
Repurchases of common shares, shares		(13,813,158)
Ending balance at Dec. 31, 2020	$ 4,515,734	$ 2,188	4,120,173	(456,393)	(12,791)	437,161	79,017	346,379
Common stock, shares outstanding at Dec. 31, 2020	218,817,337	218,817,000
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	(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
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 income (loss) of unconsolidated joint ventures	(1,696)				(1,553)		2	(145)
Amortization of equity awards	4,275		294					3,981
Sale of a 10.0% interest in 1633 Broadway	109,573		33,230			76,343
Reallocation of noncontrolling interest			(2,269)					2,269
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		221,764,000
Beginning balance at Dec. 31, 2020	$ 4,515,734	$ 2,188	4,120,173	(456,393)	(12,791)	437,161	79,017	346,379
Common stock, shares outstanding at Dec. 31, 2020	218,817,337	218,817,000
Net loss	$ (8,244)			(19,521)		13,156	56	(1,935)
Common shares issued upon redemption of common units			165
Common shares issued upon redemption of common units		10,000
Redemption of minority interest in operating partnerships								(165)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(200)	$ 1		(201)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		135,000
Repurchases of common shares, shares		0
Dividends and distributions	(33,786)			(30,654)				(3,132)
Contributions from noncontrolling interests	121					121
Distributions to noncontrolling interests	(8,562)					(8,562)
Pro rata share of other comprehensive income (loss) of unconsolidated joint ventures	4,749				4,313		12	424
Amortization of equity awards	10,311		611					9,700
Reallocation of noncontrolling interest			(7,060)					7,060
Other				(552)		552
Ending balance at Jun. 30, 2021	$ 4,480,123	$ 2,189	4,113,889	(507,321)	(8,478)	442,428	79,085	358,331
Common stock, shares outstanding at Jun. 30, 2021	218,961,870	218,962,000
Beginning balance at Mar. 31, 2021	$ 4,505,935	$ 2,189	4,111,144	(476,051)	(8,809)	438,937	79,114	359,411
Common stock, shares outstanding at Mar. 31, 2021		218,950,000
Net loss	(10,128)			(15,943)		7,428	(29)	(1,584)
Common shares issued upon redemption of common units			165
Common shares issued upon redemption of common units		10,000
Redemption of minority interest in operating partnerships								(165)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		2,000
Dividends and distributions	(16,897)			(15,327)				(1,570)
Distributions to noncontrolling interests	(3,937)					(3,937)
Pro rata share of other comprehensive income (loss) of unconsolidated joint ventures	365				331			34
Amortization of equity awards	4,785		304					4,481
Reallocation of noncontrolling interest			2,276					(2,276)
Ending balance at Jun. 30, 2021	$ 4,480,123	$ 2,189	$ 4,113,889	$ (507,321)	$ (8,478)	$ 442,428	$ 79,085	$ 358,331
Common stock, shares outstanding at Jun. 30, 2021	218,961,870	218,962,000