CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Total	Parent	Common Stock	Treasury Stock	Paid-in Capital	Retained Earnings	Noncontrolling Interest
Balance at beginning of the year at Dec. 31, 2018	$ 380,401	$ 359,720	$ 86	$ (2)	$ 258,051	$ 101,585	$ 20,681
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(26,137)	(26,920)				(26,920)	783
Distribution to equity partner	(197)	(197)			(197)
Balance at ending of the year at Dec. 31, 2019	354,067	332,603	86	(2)	257,854	74,665	21,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,464	6,669				6,669	795
Distribution to equity partner	0	2,535			2,535		(2,535)
Balance at ending of the year at Dec. 31, 2020	361,531	341,807	86	(2)	260,389	81,334	19,724
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,077	9,398				9,398	679
Cancellation of treasury stock	0			2	(2)
Balance at ending of the year at Dec. 31, 2021	$ 371,608	$ 351,205	$ 86	$ 0	$ 260,387	$ 90,732	$ 20,403