Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated other comprehensive income (loss)	Distributions in excess of accumulated earnings	Total
Balance at Dec. 31, 2014	$ 10	$ 1,273,556	$ (4,248)	$ (289,671)	$ 979,647
Balance (in shares) at Dec. 31, 2014	100,187
Increase (Decrease) in Stockholders' Equity
Comprehensive income			(2,863)	35,014	32,151
Shares issued for:
Distributions				(76,142)	(76,142)
Balance at Dec. 31, 2015	$ 10	1,273,556	(7,111)	(330,799)	935,656
Balance (in shares) at Dec. 31, 2015	100,187
Increase (Decrease) in Stockholders' Equity
Comprehensive income			12,589	8,378	20,967
Shares issued for:
Equity offering	$ 1	82,901			82,902
Equity offering (in shares)	7,044
Distributions				(77,481)	(77,481)
Balance at Dec. 31, 2016	$ 11	1,356,457	5,478	(399,902)	962,044
Balance (in shares) at Dec. 31, 2016	107,231
Increase (Decrease) in Stockholders' Equity
Comprehensive income			6,688	(15,944)	(9,256)
Shares issued for:
Distributions				(81,496)	(81,496)
Balance at Dec. 31, 2017	$ 11	$ 1,356,457	$ 12,166	$ (497,342)	$ 871,292
Balance (in shares) at Dec. 31, 2017	107,231