CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Contributed Capital [Member]	Retained Earnings [Member]
Beginning balance at Dec. 31, 2014	$ 157,497	$ 422	$ 11,693	$ 145,382
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (losses) earnings	(1,275)	0	0	(1,275)
Dividends paid on common stock	(3,712)	0	0	(3,712)
Ending balance at Dec. 31, 2015	152,510	422	11,693	140,395
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (losses) earnings	2,513	0	0	2,513
Dividends paid on common stock	(3,711)	0	0	(3,711)
Ending balance at Dec. 31, 2016	151,312	422	11,693	139,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (losses) earnings	(482)	0	0	(482)
Dividends paid on common stock	(3,711)	0	0	(3,711)
Ending balance at Dec. 31, 2017	$ 147,119	$ 422	$ 11,693	$ 135,004