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, 2017	$ 208,261	$ 189,170	$ 87	$ (2)	$ 268,950	$ (79,865)	$ 19,091
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	183,040	181,450				181,450	1,590
Series D preferred stock dividends (9% per year)	(900)	(900)			(900)
Redemption of Series D preferred stock	(10,000)	(10,000)			(10,000)
Balance at ending of the year at Dec. 31, 2018	380,401	359,720	87	(2)	258,050	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	87	(2)	257,853	74,665	21,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,464	6,669				6,669	795
Adjustment to noncontrolling interest	0	2,535			2,535		(2,535)
Balance at ending of the year at Dec. 31, 2020	$ 361,531	$ 341,807	$ 87	$ (2)	$ 260,388	$ 81,334	$ 19,724