CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2019			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	8,731	7,522			7,522		1,209
Interest rate cap/swap agreements	(6,395)	(6,395)				(6,395)
Amortization of share and unit-based plans (in shares)			80,917
Amortization of share and unit-based plans	5,603	5,603	$ 1	5,602
Distributions declared	(106,198)	(106,198)			(106,198)
Distributions to noncontrolling interests	(8,474)						(8,474)
Contributions from noncontrolling interests	125						125
Conversion of noncontrolling interests to common shares (in shares)			83,722
Conversion of noncontrolling interests to common shares	0	5,797	$ 1	5,796			(5,797)
Redemption of noncontrolling interests	(2)	(1)		(1)			(1)
Adjustment of noncontrolling interests in Operating Partnership	0	(4,599)		(4,599)			4,599
Ending balance (in shares) at Mar. 31, 2020			141,572,289
Ending balance at Mar. 31, 2020	$ 2,724,360	2,533,991	$ 1,416	4,590,709	(2,042,688)	(15,446)	190,369
Beginning balance (in shares) at Dec. 31, 2020	149,770,575		149,770,575
Beginning balance at Dec. 31, 2020	$ 2,445,260	2,257,049	$ 1,498	4,603,378	(2,339,619)	(8,208)	188,211
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(67,730)	(63,604)			(63,604)		(4,126)
Interest rate cap/swap agreements	2,694	2,694				2,694
Amortization of share and unit-based plans (in shares)			94,753
Amortization of share and unit-based plans	5,031	5,031	$ 1	5,030
Stock offerings, net (in shares)			45,992,318
Stock offerings, net	638,144	638,144	$ 460	637,684
Distributions declared	(23,332)	(23,332)			(23,332)
Distributions to noncontrolling interests	(3,338)						(3,338)
Contributions from noncontrolling interests	577						577
Conversion of noncontrolling interests to common shares (in shares)			1,178,530
Conversion of noncontrolling interests to common shares	0	22,218	$ 12	22,206			(22,218)
Redemption of noncontrolling interests	(1)						(1)
Adjustment of noncontrolling interests in Operating Partnership	$ 0	(4,304)		(4,304)			4,304
Ending balance (in shares) at Mar. 31, 2021	197,036,176		197,036,176
Ending balance at Mar. 31, 2021	$ 2,997,305	$ 2,833,896	$ 1,971	$ 5,263,994	$ (2,426,555)	$ (5,514)	$ 163,409