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 income	7,000			3,709		2,794	94	403
Common shares issued upon redemption of common units		$ 13	21,969
Common shares issued upon redemption of common units		1,288,000
Redemption of minority interest in operating partnerships								(21,982)
Common shares issued under Omnibus share plan, net of shares withheld for taxes	(301)	$ 3		(304)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		54,000
Dividends and distributions	(25,949)			(23,448)				(2,501)
Contributions from noncontrolling interests	14,496						14,496
Distributions to noncontrolling interests	(30,777)					(30,777)
Change in value of interest rate swaps	(9,026)				(8,142)			(884)
Pro rata share of other comprehensive loss of unconsolidated joint ventures	(108)				(58)		(43)	(7)
Amortization of equity awards	7,637		697					6,940
Reallocation of noncontrolling interest			(6,362)					6,362
Ending 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
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 income	$ 5,226			3,348		1,514	23	341
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	(309)	$ 3		(312)
Common shares issued under Omnibus share plan, net of shares withheld for taxes		49,000
Repurchases of common shares	(100,000)	$ (109)	(99,891)
Repurchases of common shares, shares		(10,856,865)
Dividends and distributions	(24,342)			(22,246)				(2,096)
Contributions from noncontrolling interests	8,055						8,055
Distributions to noncontrolling interests	(3,172)					(3,172)
Pro rata share of other comprehensive loss of unconsolidated joint ventures	(14,661)				(13,307)		2	(1,356)
Amortization of equity awards	5,433		398					5,035
Reallocation of noncontrolling interest			(16,664)					16,664
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	221,750,408	221,750,000