CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Comprehensive Income (Loss) [Member]	Common Stock [Member]	Treasury Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Non-controlling Interest [Member]
Balance at beginning at Dec. 31, 2018	$ 380,401	$ 101,282	$ 87	$ (2)	$ 258,050	$ 101,585	$ 20,681
Balance at beginnng (in shares) at Dec. 31, 2018			8,717,967
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distribution to equity partner	(67)				(67)
Net income (loss)	(5,426)	(15,316)				(5,609)	183
Balance at ending at Mar. 31, 2019	374,908	85,966	$ 87	(2)	257,983	95,976	20,864
Balance at ending (in shares) at Mar. 31, 2019			8,717,967
Balance at beginning at Dec. 31, 2019	354,067	74,362	$ 87	(2)	257,853	74,665	21,464
Balance at beginnng (in shares) at Dec. 31, 2019			8,717,967
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,771	4,613				4,613	158
Balance at ending at Mar. 31, 2020	$ 358,838	$ 78,975	$ 87	$ (2)	$ 257,853	$ 79,278	$ 21,622
Balance at ending (in shares) at Mar. 31, 2020			8,717,967