CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Distributions in Excess of Accumulated Earnings	Non-controlling Interests
Beginning Balance (in shares) at Dec. 31, 2016				89,368,899
Beginning balance at Dec. 31, 2016	$ 1,504,326	$ 1,495,456		$ 894	$ 1,981,136	$ 0	$ (486,574)	$ 8,870
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued through distribution reinvestment plan (in shares)				2,813,635
Common stock issued through distribution reinvestment plan	61,206	61,206		$ 28	61,178
Common stock repurchases (in shares)				(1,554,768)
Common stock repurchases	(33,627)	(33,599)		$ (16)	(33,583)			(28)
Share-based compensation (in shares)				375,000
Share-based compensation, net	470	470		$ 4	466
Distributions declared on common stock	(135,904)	(135,904)					(135,904)
Preferred stock dividends	0
Contributions from non-controlling interest holders	472							472
Distributions to non-controlling interest holders	(645)							(645)
Unrealized gain on designated derivative	2,473	2,473				2,473
Net loss	(42,712)	(42,548)					(42,548)	(164)
Ending Balance (in shares) at Dec. 31, 2017				91,002,766
Ending balance at Dec. 31, 2017	$ 1,356,059	1,347,554		$ 910	2,009,197	2,473	(665,026)	8,505
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued through distribution reinvestment plan (in shares)	1,700,000			1,720,633
Common stock issued through distribution reinvestment plan	$ 35,737	35,737		$ 17	35,720
Common stock repurchases (in shares)				(759,867)
Common stock repurchases	(14,202)	(14,202)		$ (8)	(14,194)
Share-based compensation, net	1,244	1,244			1,244
Distributions declared on common stock	(86,543)	(86,543)					(86,543)
Preferred stock dividends	0
Distributions to non-controlling interest holders	(492)							(492)
Unrealized gain on designated derivative	2,109	2,109				2,109
Net loss	(52,978)	(52,762)					(52,762)	(216)
Ending Balance (in shares) at Dec. 31, 2018				91,963,532
Ending balance at Dec. 31, 2018	1,240,934	1,233,137		$ 919	2,031,967	4,582	(804,331)	7,797
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues			1,610,000
Issuance of Preferred Stock, net	$ 37,617	37,617	$ 16		37,601
Common stock issued through distribution reinvestment plan (in shares)	1,500,000			1,481,395
Common stock issued through distribution reinvestment plan	$ 27,210	27,210		$ 15	27,195
Common stock repurchases (in shares)				(1,103,263)
Common stock repurchases	(21,113)	(21,113)		$ (11)	(21,102)
Share-based compensation (in shares)				15,000
Share-based compensation, net	1,319	1,319			1,319
Distributions declared on common stock	(78,685)	(78,685)					(78,685)
Preferred stock dividends	(173)	(173)					(173)
Distributions to non-controlling interest holders	(346)							(346)
Unrealized gain on designated derivative	(11,625)	(11,625)				(11,625)
Net loss	(88,307)	(87,914)					(87,914)	(393)
Rebalancing of ownership percentage	0	1,648			1,648			(1,648)
Ending Balance (in shares) at Dec. 31, 2019			1,610,000	92,356,664
Ending balance at Dec. 31, 2019	$ 1,106,744	$ 1,101,334	$ 16	$ 923	$ 2,078,628	$ (7,043)	$ (971,190)	$ 5,410