CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Total Stockholders' Equity	Total Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Noncontrolling Interests
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
Balance (in shares) at Dec. 31, 2018					141,221,712
Increase (Decrease) in Stockholders' Equity
Net income (loss)	102,554		96,820				96,820			5,734
Interest rate cap/swap agreements	(4,585)		(4,585)						(4,585)
Amortization of share and unit-based plans	16,723		16,723		$ 1	16,722
Amortization of share and unit-based plans (in shares)					106,747
Employee stock purchases	1,519		1,519		$ 1	1,518
Employee stock purchases (in shares)					58,191
Distributions declared	(424,272)		(424,272)				(424,272)
Distributions to noncontrolling interests	(50,262)									(50,262)
Contributions from noncontrolling interests	3,131									3,131
Conversion of noncontrolling interests to common shares	0		1,005			1,005				(1,005)
Conversion of noncontrolling interests to common shares (in shares)					21,000
Redemption of noncontrolling interests	(67)		(31)			(31)				(36)
Adjustment of noncontrolling interests in Operating Partnership	0		(2,946)			(2,946)				2,946
Balance at Dec. 31, 2019	2,830,970		2,632,262		$ 1,414	4,583,911	(1,944,012)		(9,051)	198,708
Balance (in shares) at Dec. 31, 2019					141,407,650
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(245,462)		(230,203)				(230,203)			(15,259)
Interest rate cap/swap agreements	843		843						843
Amortization of share and unit-based plans	18,066		18,066		$ 1	18,065
Amortization of share and unit-based plans (in shares)					151,468
Employee stock purchases	1,531		1,531		$ 3	1,528
Employee stock purchases (in shares)					265,386
Stock offerings, net	830,241
Distributions declared	(165,404)		(165,404)				(165,404)
Stock dividend	0				$ 78	(78)
Stock dividend (in shares)					7,759,280
Distributions to noncontrolling interests	(14,458)									(14,458)
Contributions from noncontrolling interests	19,203									19,203
Conversion of noncontrolling interests to common shares	0		12,086		$ 2	12,084				(12,086)
Conversion of noncontrolling interests to common shares (in shares)					186,791
Redemption of noncontrolling interests	(29)		25			25				(54)
Adjustment of noncontrolling interests in Operating Partnership	0		(12,157)			(12,157)				12,157
Balance at Dec. 31, 2020	$ 2,445,260		2,257,049		$ 1,498	4,603,378	(2,339,619)		(8,208)	188,211
Balance (in shares) at Dec. 31, 2020	149,770,575				149,770,575
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ 16,163		14,263				14,263			1,900
Interest rate cap/swap agreements	8,184		8,184						8,184
Amortization of share and unit-based plans	17,998		17,998		$ 2	17,996
Amortization of share and unit-based plans (in shares)					248,264
Employee stock purchases	1,348		1,348		$ 1	1,347
Employee stock purchases (in shares)					143,191
Stock offerings, net			830,241		$ 620	829,621
Stock offerings, net (in shares)					62,049,131
Distributions declared	(118,340)		(118,340)				(118,340)
Distributions to noncontrolling interests	(25,107)									(25,107)
Contributions from noncontrolling interests	580									580
Conversion of noncontrolling interests to common shares	0		48,807		$ 26	48,781				(48,807)
Conversion of noncontrolling interests to common shares (in shares)					2,585,896
Redemption of noncontrolling interests	(178)		(17)			(17)				(161)
Adjustment of noncontrolling interests in Operating Partnership	0		(12,666)			(12,666)				12,666
Balance at Dec. 31, 2021	$ 3,176,149		$ 3,046,867		$ 2,147	$ 5,488,440	$ (2,443,696)		$ (24)	$ 129,282
Balance (in shares) at Dec. 31, 2021	214,797,057				214,797,057