CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Series D Preferred Shares	Common Shares	Additional Paid in Capital	Cumulative Net Income	Cumulative Common Distributions	Cumulative Preferred Distributions	Noncontrolling Interest
Balance as of beginning of period (in shares) at Dec. 31, 2019		4,915,196	121,924,199
Balance as of beginning of period at Dec. 31, 2019	$ 3,245,872	$ 119,263	$ 1,219	$ 4,313,831	$ 3,363,654	$ (3,851,666)	$ (701,724)	$ 1,295
Increase (Decrease) in Stockholders' Equity
Net (loss) income	453,763				452,960			803
Repurchase of shares (in shares)			(711,000)
Repurchase of shares	(20,869)		$ (7)	(20,862)
Surrender of shares for tax withholding (in shares)			(183,992)
Surrender of shares for tax withholding	(6,026)		$ (2)	(6,024)
Share-based compensation (in shares)			495,303
Share-based compensation	9,891		$ 5	8,767				1,119
Contributions	1							1
Distributions	(439,495)					(432,384)	(5,991)	(1,120)
Redemption of noncontrolling interest	(31)							(31)
Adjustment for noncontrolling interest				(4,419)				4,419
Balance as of end of period (in shares) at Sep. 30, 2020		4,915,196	121,524,510
Balance as of end of period at Sep. 30, 2020	3,243,106	$ 119,263	$ 1,215	4,291,293	3,816,614	(4,284,050)	(707,715)	6,486
Balance as of beginning of period (in shares) at Jun. 30, 2020		4,915,196	121,521,624
Balance as of beginning of period at Jun. 30, 2020	3,673,741	$ 119,263	$ 1,215	4,288,245	3,816,245	(3,852,856)	(705,718)	7,347
Increase (Decrease) in Stockholders' Equity
Net (loss) income	370				369			1
Surrender of shares for tax withholding (in shares)			(526)
Surrender of shares for tax withholding	(14)			(14)
Share-based compensation (in shares)			3,412
Share-based compensation	3,320			2,908				412
Distributions	(434,311)					(431,194)	(1,997)	(1,120)
Adjustment for noncontrolling interest				154				(154)
Balance as of end of period (in shares) at Sep. 30, 2020		4,915,196	121,524,510
Balance as of end of period at Sep. 30, 2020	3,243,106	$ 119,263	$ 1,215	4,291,293	3,816,614	(4,284,050)	(707,715)	6,486
Balance as of beginning of period (in shares) at Dec. 31, 2020		4,915,196	121,522,555
Balance as of beginning of period at Dec. 31, 2020	3,243,164	$ 119,263	$ 1,215	4,294,632	3,814,948	(4,283,668)	(709,712)	6,486
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(14,792)				(14,762)			(30)
Repurchase of shares (in shares)			(430,871)
Repurchase of shares	(18,045)		$ (4)	(18,041)
Surrender of shares for tax withholding (in shares)			(245,215)
Surrender of shares for tax withholding	(7,072)		$ (2)	(7,070)
Share-based compensation (in shares)			664,633
Share-based compensation	12,589		$ 6	11,889				694
Distributions	(4,010)					1,914	(5,991)	67
Adjustment for noncontrolling interest				696				(696)
Balance as of end of period (in shares) at Sep. 30, 2021		4,915,196	121,511,102
Balance as of end of period at Sep. 30, 2021	3,211,834	$ 119,263	$ 1,215	4,282,106	3,800,186	(4,281,754)	(715,703)	6,521
Balance as of beginning of period (in shares) at Jun. 30, 2021		4,915,196	121,940,355
Balance as of beginning of period at Jun. 30, 2021	3,231,836	$ 119,263	$ 1,219	4,297,197	3,802,994	(4,281,670)	(713,706)	6,539
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(2,814)				(2,808)			(6)
Repurchase of shares (in shares)			(430,871)
Repurchase of shares	(18,045)		$ (4)	(18,041)
Surrender of shares for tax withholding (in shares)			(1,186)
Surrender of shares for tax withholding	(31)			(31)
Share-based compensation (in shares)			2,804
Share-based compensation	2,988			2,801				187
Distributions	(2,100)					(84)	(1,997)	(19)
Adjustment for noncontrolling interest				180				(180)
Balance as of end of period (in shares) at Sep. 30, 2021		4,915,196	121,511,102
Balance as of end of period at Sep. 30, 2021	$ 3,211,834	$ 119,263	$ 1,215	$ 4,282,106	$ 3,800,186	$ (4,281,754)	$ (715,703)	$ 6,521