Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total Stockholders' Equity	Noncontrolling Interests	Cumulative effect of ASC 842 adoption	Cumulative effect of ASC 842 adoption Accumulated Deficit	Cumulative effect of ASC 842 adoption Total Stockholders' Equity
Beginning balance (in shares) at Dec. 31, 2018			204,536,485
Beginning Balance at Dec. 31, 2018	$ 1,890,593		$ 2,045	$ 2,126,472	$ (245,620)	$ 1,882,897	$ 7,696	$ (15,286)	$ (15,286)	$ (15,286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			55,916
Share-based compensation	1,157		$ 1	1,073		1,074	83
Common stock repurchased and retired (in shares)			(3,143,922)
Common stock repurchased and retired	(29,998)		$ (31)	(29,967)		(29,998)
Net income (loss)	8,980				8,945	8,945	35
Distributions on common stock/units	(25,504)			113	(25,483)	(25,370)	(134)
Ending balance (in shares) at Mar. 31, 2019			201,448,479
Ending Balance at Mar. 31, 2019	1,829,942		$ 2,015	2,097,691	(277,444)	1,822,262	7,680
Beginning balance (in shares) at Dec. 31, 2018			204,536,485
Beginning Balance at Dec. 31, 2018	1,890,593		$ 2,045	2,126,472	(245,620)	1,882,897	7,696	$ (15,286)	$ (15,286)	$ (15,286)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	49,628
Ending balance (in shares) at Sep. 30, 2019			200,196,850
Ending Balance at Sep. 30, 2019	1,810,354		$ 2,002	2,087,937	(287,582)	1,802,357	7,997
Beginning balance (in shares) at Mar. 31, 2019			201,448,479
Beginning Balance at Mar. 31, 2019	1,829,942		$ 2,015	2,097,691	(277,444)	1,822,262	7,680
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			33,396
Share-based compensation	2,205		$ 1	1,955		1,956	249
Common stock repurchased and retired (in shares)			(1,004,589)
Common stock repurchased and retired	(10,032)		$ (11)	(10,021)		(10,032)
Net income (loss)	29,074				28,960	28,960	114
Distributions on common stock/units	(25,379)			120	(25,365)	(25,245)	(134)
Ending balance (in shares) at Jun. 30, 2019			200,477,286
Ending Balance at Jun. 30, 2019	1,825,810		$ 2,005	2,089,745	(273,849)	1,817,901	7,909
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	1,098			866	59	925	173
Common stock repurchased and retired (in shares)			(280,436)
Common stock repurchased and retired	(2,799)		$ (3)	(2,796)		(2,799)
Net income (loss)	11,574				11,529	11,529	45
Distributions on common stock/units	(25,329)			122	(25,321)	(25,199)	(130)
Ending balance (in shares) at Sep. 30, 2019			200,196,850
Ending Balance at Sep. 30, 2019	1,810,354		$ 2,002	2,087,937	(287,582)	1,802,357	7,997
Beginning balance (in shares) at Dec. 31, 2019		0	200,207,795
Beginning Balance at Dec. 31, 2019	1,921,062	$ 0	$ 2,002	2,089,349	(178,861)	1,912,490	8,572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			154,981
Share-based compensation	428		$ 1	189		190	238
Redemption of Operating Partnership units	$ (201)			(15)		(15)	(186)
Common stock repurchased and retired (in shares)	(1,119,438)		(1,119,438)
Common stock repurchased and retired	$ (10,000)		$ (11)	(9,989)		(10,000)
Net income (loss)	(34,692)				(34,559)	(34,559)	(133)
Ending balance (in shares) at Mar. 31, 2020		0	199,243,338
Ending Balance at Mar. 31, 2020	1,876,597	$ 0	$ 1,992	2,079,534	(213,420)	1,868,106	8,491
Beginning balance (in shares) at Dec. 31, 2019		0	200,207,795
Beginning Balance at Dec. 31, 2019	1,921,062	$ 0	$ 2,002	2,089,349	(178,861)	1,912,490	8,572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(187,714)
Ending balance (in shares) at Sep. 30, 2020		47,600	199,518,880
Ending Balance at Sep. 30, 2020	1,842,189	$ 48	$ 1,995	2,198,376	(366,635)	1,833,784	8,405
Beginning balance (in shares) at Mar. 31, 2020		0	199,243,338
Beginning Balance at Mar. 31, 2020	1,876,597	$ 0	$ 1,992	2,079,534	(213,420)	1,868,106	8,491
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			137,616
Share-based compensation	2,341		$ 2	2,054	4	2,060	281
Net income (loss)	(73,387)				(72,782)	(72,782)	(605)
Sale of stock, net of placement fees and expenses (in shares)			135,481
Sale of stock, net of placement fees and expenses	1,014		$ 1	1,013		1,014
Ending balance (in shares) at Jun. 30, 2020		0	199,516,435
Ending Balance at Jun. 30, 2020	1,806,565	$ 0	$ 1,995	2,082,601	(286,198)	1,798,398	8,167
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			2,445
Share-based compensation	1,633			1,352		1,352	281
Net income (loss)	(79,635)				(79,592)	(79,592)	(43)
Sale of stock, net of placement fees and expenses (in shares)		47,600
Sale of stock, net of placement fees and expenses	114,471	$ 48		114,423		114,471
Distributions on preferred stock	(845)				(845)	(845)
Ending balance (in shares) at Sep. 30, 2020		47,600	199,518,880
Ending Balance at Sep. 30, 2020	$ 1,842,189	$ 48	$ 1,995	$ 2,198,376	$ (366,635)	$ 1,833,784	$ 8,405