CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Cumulative Distributions and Net Income (Loss)
Balance (in shares) at Dec. 31, 2018		186,464,794
Balance at Dec. 31, 2018	$ 661,474	$ 1,865	$ 1,667,897	$ (1,008,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,878			21,878
Redemptions of common stock (in shares)		(593,771)
Redemptions of common stock	(2,907)	$ (6)	(2,901)
Transfers from redeemable common stock	2,907		2,907
Distributions declared	(106,719)			(106,719)
Balance (in shares) at Jun. 30, 2019		185,871,023
Balance at Jun. 30, 2019	576,633	$ 1,859	1,667,903	(1,093,129)
Balance (in shares) at Mar. 31, 2019		186,188,796
Balance at Mar. 31, 2019	645,042	$ 1,862	1,667,900	(1,024,720)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,778			26,778
Redemptions of common stock (in shares)		(317,773)
Redemptions of common stock	(1,540)	$ (3)	(1,537)
Transfers from redeemable common stock	1,540		1,540
Distributions declared	(95,187)			(95,187)
Balance (in shares) at Jun. 30, 2019		185,871,023
Balance at Jun. 30, 2019	$ 576,633	$ 1,859	1,667,903	(1,093,129)
Balance (in shares) at Dec. 31, 2019	185,302,037	185,302,037
Balance at Dec. 31, 2019	$ 537,223	$ 1,853	1,662,555	(1,127,185)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,044			2,044
Redemptions of common stock (in shares)		(73,817)
Redemptions of common stock	(280)	$ (1)	(279)
Transfers from redeemable common stock	280		280
Balance (in shares) at Jan. 31, 2020		185,228,220
Balance at Jan. 31, 2020	$ 539,267	$ 1,852	$ 1,662,556	$ (1,125,141)