Condensed Consolidated Statements of Stockholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid in Capital [Member]	Cumulative Net Income [Member]	Accumulated Other Comprehensive Loss [Member]	Cumulative Dividends [Member]
Beginning Balance at Dec. 31, 2016	$ 194,007	$ 0	$ 130	$ 214,323	$ 1,265	$ 0	$ (21,711)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	653		1	652
Unrecognized loss on cash flow hedges	(598)					(598)
Reclassification adjustment for losses included in net income (interest expense)	162					162
Net income	1,379				1,379
Dividends to common stockholders ($0.7775 per share)	(10,189)						(10,189)
Ending Balance at Jun. 30, 2017	$ 185,414	$ 0	$ 131	$ 214,975	$ 2,644	$ (436)	$ (31,900)