Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Distributions in Excess of Earnings	Non-controlling Interests	Series A Preferred Stock Preferred Stock	Series L Preferred Stock Preferred Stock
Beginning balance (in shares) at Dec. 31, 2016		84,048,081
Beginning balance at Dec. 31, 2016	$ 966,589	$ 84	$ 1,566,073	$ (509)	$ (599,971)	$ 912
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense (in shares)		0
Stock-based compensation expense	49		49
Common dividends	(18,386)				(18,386)
Issuance of Series A Preferred Warrants	4		4
Dividends to holders of Series A Preferred Stock	(31)				(31)
Reclassification of Series A Preferred Stock to permanent equity	0
Other comprehensive income	1,552			1,552
Net income	193,935				193,930	5
Ending balance (in shares) at Mar. 31, 2017		84,048,081
Ending balance at Mar. 31, 2017	1,143,712	$ 84	1,566,126	1,043	(424,458)	917
Beginning balance (in shares) at Dec. 31, 2017		43,784,939					60,592	8,080,740
Beginning balance at Dec. 31, 2017	626,705	$ 44	792,631	1,631	(399,250)	890	$ 1,508	$ 229,251
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense (in shares)		0
Stock-based compensation expense	38		38
Common dividends	(5,473)				(5,473)
Issuance of Series A Preferred Warrants	17		17
Dividends to holders of Series A Preferred Stock	(493)				(493)
Reclassification of Series A Preferred Stock to permanent equity (in shares)							82,841
Reclassification of Series A Preferred Stock to permanent equity	1,885		(175)				$ 2,060
Redemption of Series A Preferred Stock	1		1
Other comprehensive income	1,183			1,183
Net income	622				618	4
Ending balance (in shares) at Mar. 31, 2018		43,784,939					143,433	8,080,740
Ending balance at Mar. 31, 2018	$ 624,485	$ 44	$ 792,512	$ 2,814	$ (404,598)	$ 894	$ 3,568	$ 229,251