Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interests	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Dividends in Excess of Cumulative Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 861,865		$ 25	$ 1,741	$ 1,965,897		$ (1,161,351)	$ 806,312	$ 55,553
Beginning balance of redeemable noncontrolling partnership interests at Dec. 31, 2019		$ 2,160
Net loss	(138,136)						(122,673)	(122,673)	(15,463)
Net loss		(1,158)
Other comprehensive income (loss)	22					$ 22		22
Conversion of Operating Partnership common units into shares of common stock				163	20,888			21,051	(21,051)
Issuance of shares of common stock and restricted common stock	537			17	520			537
Cancellation of shares of restricted common stock	(97)			(1)	(96)			(97)
Amortization of deferred compensation	633				633			633
Performance stock units	390				390			390
Adjustment for noncontrolling interests	(60)	60			(10,341)			(10,341)	10,281
Distributions to noncontrolling interests	(731)								(731)
Contributions from noncontrolling interests	668								668
Ending balance at Mar. 31, 2020	725,091		25	1,920	1,977,891	22	(1,284,024)	695,834	29,257
Ending balance of redeemable noncontrolling partnership interests at Mar. 31, 2020		1,062
Beginning balance at Dec. 31, 2019	861,865		25	1,741	1,965,897		(1,161,351)	806,312	55,553
Beginning balance of redeemable noncontrolling partnership interests at Dec. 31, 2019		2,160
Conversion of Operating Partnership common units into shares of common stock	21,065
Ending balance at Sep. 30, 2020	612,218		25	1,958	1,984,607	33	(1,397,131)	589,492	22,726
Ending balance of redeemable noncontrolling partnership interests at Sep. 30, 2020		193
Beginning balance at Mar. 31, 2020	725,091		25	1,920	1,977,891	22	(1,284,024)	695,834	29,257
Beginning balance of redeemable noncontrolling partnership interests at Mar. 31, 2020		1,062
Net loss	(72,139)						(70,229)	(70,229)	(1,910)
Net loss		(654)
Other comprehensive income (loss)	(64)					(64)		(64)
Issuance of shares of common stock and restricted common stock	2				2			2
Cancellation of shares of restricted common stock	(14)				(14)			(14)
Amortization of deferred compensation	384				384			384
Performance stock units	379				379			379
Adjustment for noncontrolling interests	(117)	117			3,812			3,812	(3,929)
Distributions to noncontrolling interests	(94)								(94)
Contributions from noncontrolling interests	25								25
Ending balance at Jun. 30, 2020	653,453		25	1,920	1,982,454	(42)	(1,354,253)	630,104	23,349
Ending balance of redeemable noncontrolling partnership interests at Jun. 30, 2020		525
Net loss	(44,002)						(42,878)	(42,878)	(1,124)
Net loss		(422)
Other comprehensive income (loss)	75					75		75
Conversion of Operating Partnership common units into shares of common stock				38	(25)			13	(13)
Cancellation of shares of restricted common stock	(1)				(1)			(1)
Amortization of deferred compensation	375				375			375
Performance stock units	2,420				2,420			2,420
Adjustment for noncontrolling interests	(91)	90			(616)			(616)	525
Distributions to noncontrolling interests	(11)								(11)
Ending balance at Sep. 30, 2020	612,218		25	1,958	1,984,607	33	(1,397,131)	589,492	22,726
Ending balance of redeemable noncontrolling partnership interests at Sep. 30, 2020		193
Beginning balance at Dec. 31, 2020	534,297		25	1,966	1,986,269	18	(1,456,435)	531,843	2,454
Beginning balance of redeemable noncontrolling partnership interests at Dec. 31, 2020		(265)
Net loss	(28,067)						(26,763)	(26,763)	(1,304)
Net loss		(213)
Other comprehensive income (loss)	3					3		3
Cancellation of shares of restricted common stock	(1)			(1)				(1)
Amortization of deferred compensation	304				304			304
Performance stock units	93				93			93
Distributions to noncontrolling interests	(11)								(11)
Ending balance at Mar. 31, 2021	506,618		25	1,965	1,986,666	21	(1,483,198)	505,479	1,139
Ending balance of redeemable noncontrolling partnership interests at Mar. 31, 2021		(478)
Net loss	(9,491)						(8,882)	(8,882)	(609)
Net loss		(70)
Other comprehensive income (loss)	(27)					(27)		(27)
Cancellation of shares of restricted common stock	(18)			(1)	(17)			(18)
Amortization of deferred compensation	256				256			256
Performance stock units	94				94			94
Adjustment for noncontrolling interests	(5)	5			(17)			(17)	12
Distributions to noncontrolling interests	(343)								(343)
Ending balance at Jun. 30, 2021	497,084		25	1,964	1,986,982	(6)	(1,492,080)	496,885	199
Ending balance of redeemable noncontrolling partnership interests at Jun. 30, 2021		(543)
Net loss	(42,551)	(330)					(41,720)	(41,720)	(831)
Other comprehensive income (loss)	13					13		13
Conversion of Operating Partnership common units into shares of common stock				12	194			206	(206)
Cancellation of shares of restricted common stock	(8)				(8)			(8)
Amortization of deferred compensation	252				252			252
Performance stock units	93				93			93
Adjustment for noncontrolling interests	(2)	2			(602)			(602)	600
Contributions from noncontrolling interests	298								298
Ending balance at Sep. 30, 2021	$ 455,179		$ 25	$ 1,976	$ 1,986,911	$ 7	$ (1,533,800)	$ 455,119	$ 60
Ending balance of redeemable noncontrolling partnership interests at Sep. 30, 2021		$ (871)