Condensed Consolidated Statements of Shareholders' Deficit (unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect Adjustment for Adoption of New Accounting Standard	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect Adjustment for Adoption of New Accounting Standard	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Accumulated Earnings	Distributions in Excess of Accumulated Earnings Cumulative Effect Adjustment for Adoption of New Accounting Standard	Noncontrolling Interest - OP Units	Noncontrolling Interest - Non-voting Preferred Shares
Beginning balance, value at Dec. 31, 2020	$ (2,072,376)	$ (45,310)	$ 23	$ 1,209,141	$ (59,908)	$ (20,367)	$ (3,330,455)	$ 14,598	$ 69,157	$ 125
Beginning balance, shares at Dec. 31, 2020			231,261,958
Net income (loss)	(4,502)						(4,438)		(64)
Other comprehensive income	2,829					2,787			42
Common stock dividends declared	(35,128)						(35,128)
Distributions to noncontrolling interest declared	(520)								(520)
Payments related to tax withholding for stock-based compensation	(2,306)			(2,306)
Stock-based compensation	3,335			3,335
Stock-based compensation, shares			396,481
Issuance of common stock - employee stock purchase plan	288			288
Issuance of common stock - employee stock purchase plan, in shares			35,764
Ending balance, value at Mar. 31, 2021	(2,153,690)		$ 23	1,150,550		(17,580)	(3,355,423)		68,615	125
Ending balance, shares at Mar. 31, 2021			231,694,203
Beginning balance, value at Dec. 31, 2021	(2,113,774)		$ 23	1,214,830		(9,164)	(3,333,481)		13,893	125
Beginning balance, shares at Dec. 31, 2021			234,779,247
Net income (loss)	52,858						52,730		128
Other comprehensive income	2,830					2,823			7
Common stock dividends declared	(35,905)						(35,905)
Distributions to noncontrolling interest declared	(82)								(82)
Exchange of noncontrolling interest				3,158					(3,158)
Exchange of noncontrolling interest, shares			157,733
Cumulative non-voting convertible preferred stock							(125)			125
Payments related to tax withholding for stock-based compensation	(1,525)			(1,525)
Stock-based compensation	3,312			3,312
Stock-based compensation, shares			331,686
Issuance of common stock - employee stock purchase plan	264			264
Issuance of common stock - employee stock purchase plan, in shares			29,324
Ending balance, value at Mar. 31, 2022	$ (2,092,022)		$ 23	$ 1,220,039		$ (6,341)	$ (3,316,781)		$ 10,788	$ 250
Ending balance, shares at Mar. 31, 2022			235,297,990