CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Cumulative effect of adoption of ASC 842	Total Stockholders' Equity	Total Stockholders' Equity Cumulative effect of adoption of ASC 842	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Cumulative effect of adoption of ASC 842	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018					141,221,712
Beginning balance at Dec. 31, 2018	$ 3,188,432	$ (2,203)	$ 2,950,232	$ (2,203)	$ 1,412	$ 4,567,643	$ (1,614,357)	$ (2,203)	$ (4,466)	$ 238,200
Increase (Decrease) in Stockholders' Equity
Net (loss) income	22,790		23,558				23,558			(768)
Interest rate cap/swap agreements	(6,326)		(6,326)						(6,326)
Amortization of share and unit-based plans (in shares)					95,056
Amortization of share and unit-based plans	10,038		10,038		$ 1	10,037
Employee stock purchases (in shares)					26,800
Employee stock purchases	819		819			819
Distributions declared	(212,095)		(212,095)				(212,095)
Distributions to noncontrolling interests	(32,458)									(32,458)
Contributions from noncontrolling interests	410									410
Conversion of noncontrolling interests to common shares (in shares)					21,000
Conversion of noncontrolling interests to common shares	0		1,005			1,005				(1,005)
Redemption of noncontrolling interests	(37)		(20)			(20)				(17)
Adjustment of noncontrolling interests in Operating Partnership	0		(864)			(864)				864
Ending balance (in shares) at Jun. 30, 2019					141,364,568
Ending balance at Jun. 30, 2019	2,969,370		2,764,144		$ 1,413	4,578,620	(1,805,097)		(10,792)	205,226
Beginning balance (in shares) at Mar. 31, 2019					141,332,786
Beginning balance at Mar. 31, 2019	3,085,269		2,854,713		$ 1,413	4,574,600	(1,714,789)		(6,511)	230,556
Increase (Decrease) in Stockholders' Equity
Net (loss) income	13,947		15,734				15,734			(1,787)
Interest rate cap/swap agreements	(4,281)		(4,281)						(4,281)
Amortization of share and unit-based plans (in shares)					4,982
Amortization of share and unit-based plans	3,373		3,373			3,373
Employee stock purchases (in shares)					26,800
Employee stock purchases	819		819			819
Distributions declared	(106,042)		(106,042)				(106,042)
Distributions to noncontrolling interests	(24,115)									(24,115)
Conversion of noncontrolling interests to common shares	410									410
Redemption of noncontrolling interests	(10)		(5)			(5)				(5)
Adjustment of noncontrolling interests in Operating Partnership	0		(167)			(167)				167
Ending balance (in shares) at Jun. 30, 2019					141,364,568
Ending balance at Jun. 30, 2019	$ 2,969,370		2,764,144		$ 1,413	4,578,620	(1,805,097)		(10,792)	205,226
Beginning balance (in shares) at Dec. 31, 2019	141,407,650				141,407,650
Beginning balance at Dec. 31, 2019	$ 2,830,970		2,632,262		$ 1,414	4,583,911	(1,944,012)		(9,051)	198,708
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(17,996)		(17,594)				(17,594)			(402)
Interest rate cap/swap agreements	(4,650)		(4,650)						(4,650)
Amortization of share and unit-based plans (in shares)					126,088
Amortization of share and unit-based plans	9,813		9,813		$ 1	9,812
Employee stock purchases (in shares)					141,568
Employee stock purchases	852		852		$ 1	851
Distributions declared	(120,476)		(120,476)				(120,476)
Stock dividend (in shares)					7,759,280
Stock dividend					$ 78	(78)
Distributions to noncontrolling interests	(10,061)									(10,061)
Contributions from noncontrolling interests	125									125
Conversion of noncontrolling interests to common shares (in shares)					166,578
Conversion of noncontrolling interests to common shares	0		11,677		$ 2	11,675				(11,677)
Redemption of noncontrolling interests	(18)		13			13				(31)
Adjustment of noncontrolling interests in Operating Partnership	$ 0		(9,500)			(9,500)				9,500
Ending balance (in shares) at Jun. 30, 2020	149,601,164				149,601,164
Ending balance at Jun. 30, 2020	$ 2,688,559		2,502,397		$ 1,496	4,596,684	(2,082,082)		(13,701)	186,162
Beginning balance (in shares) at Mar. 31, 2020					141,572,289
Beginning balance at Mar. 31, 2020	2,724,360		2,533,991		$ 1,416	4,590,709	(2,042,688)		(15,446)	190,369
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(26,727)		(25,116)				(25,116)			(1,611)
Interest rate cap/swap agreements	1,745		1,745						1,745
Amortization of share and unit-based plans (in shares)					45,171
Amortization of share and unit-based plans	4,210		4,210			4,210
Employee stock purchases (in shares)					141,568
Employee stock purchases	852		852		$ 1	851
Distributions declared	(14,278)		(14,278)				(14,278)
Stock dividend (in shares)					7,759,280
Stock dividend					$ 78	(78)
Distributions to noncontrolling interests	(1,587)									(1,587)
Conversion of noncontrolling interests to common shares (in shares)					82,856
Conversion of noncontrolling interests to common shares	0		5,880		$ 1	5,879				(5,880)
Redemption of noncontrolling interests	(16)		14			14				(30)
Adjustment of noncontrolling interests in Operating Partnership	$ 0		(4,901)			(4,901)				4,901
Ending balance (in shares) at Jun. 30, 2020	149,601,164				149,601,164
Ending balance at Jun. 30, 2020	$ 2,688,559		$ 2,502,397		$ 1,496	$ 4,596,684	$ (2,082,082)		$ (13,701)	$ 186,162