Consolidated Statements of Equity - USD ($) $ in Thousands	Total	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)	38,054
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
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
Beginning balance (in shares) at Dec. 31, 2019		200,207,795
Beginning Balance at Dec. 31, 2019	1,921,062	$ 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		199,243,338
Ending Balance at Mar. 31, 2020	1,876,597	$ 1,992	2,079,534	(213,420)	1,868,106	8,491
Beginning balance (in shares) at Dec. 31, 2019		200,207,795
Beginning Balance at Dec. 31, 2019	1,921,062	$ 2,002	2,089,349	(178,861)	1,912,490	8,572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(108,079)
Ending balance (in shares) at Jun. 30, 2020		199,516,435
Ending Balance at Jun. 30, 2020	1,806,565	$ 1,995	2,082,601	(286,198)	1,798,398	8,167
Beginning balance (in shares) at Mar. 31, 2020		199,243,338
Beginning Balance at Mar. 31, 2020	1,876,597	$ 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 common stock in secondary offerings, net of placement fees and expenses of $10 (in shares)		135,481
Sale of common stock in follow-on offerings, net of placement fees and expenses of $10	1,014	$ 1	1,013		1,014
Ending balance (in shares) at Jun. 30, 2020		199,516,435
Ending Balance at Jun. 30, 2020	$ 1,806,565	$ 1,995	$ 2,082,601	$ (286,198)	$ 1,798,398	$ 8,167