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 (loss)	2,386			2,386
Redemptions of common stock (in shares)		(913,358)
Redemptions of common stock	(4,345)	$ (9)	(4,336)
Transfers from redeemable common stock	4,345		4,345
Distributions declared	(117,169)			(117,169)
Balance (in shares) at Sep. 30, 2019		185,551,436
Balance at Sep. 30, 2019	546,691	$ 1,856	1,667,906	(1,123,071)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(19,492)			(19,492)
Redemptions of common stock (in shares)		(319,587)
Redemptions of common stock	(1,438)	$ (3)	(1,435)
Transfers from redeemable common stock	1,438		1,438
Distributions declared	(10,450)			(10,450)
Balance (in shares) at Sep. 30, 2019		185,551,436
Balance at Sep. 30, 2019	$ 546,691	$ 1,856	1,667,906	(1,123,071)
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 (loss)	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)