UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Contributed Capital	Retained Earnings
Beginning balance at Dec. 31, 2016	$ 151,312	$ 422	$ 11,693	$ 139,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (losses) earnings	(860)			(860)
Dividends paid on common stock	(928)			(928)
Ending balance at Mar. 31, 2017	149,524	422	11,693	137,409
Beginning balance at Dec. 31, 2017	147,119	422	11,693	135,004
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (losses) earnings	1,138			1,138
Dividends paid on common stock	(928)			(928)
Ending balance at Mar. 31, 2018	$ 147,329	$ 422	$ 11,693	$ 135,214