UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Warrants [Member]	Additional Paid in Capital [Member]	Accumulated Earnings (Deficit) [Member]
Balance at Dec. 31, 2019	$ 434,207	$ 209	$ 4,790	$ 424,399	$ 4,809
Net income (loss)	(367,199)	0	0	0	(367,199)
Share-based compensation expense	(1,112)	0	0	(1,112)	0
Restricted shares repurchased	(14)	0	0	(14)	0
Dividends	(3,786)	0	0	0	(3,786)
Balance at Mar. 31, 2020	62,096	209	4,790	423,273	(366,176)
Balance at Dec. 31, 2020	(33,737)	378	4,788	424,104	(463,007)
Net income (loss)	(19,328)	0	0	0	(19,328)
Share-based compensation expense	(204)	0	0	(204)	0
Restricted shares repurchased	(5)	0	0	(5)	0
Other	0	3	0	(3)	0
Balance at Mar. 31, 2021	$ (53,274)	$ 381	$ 4,788	$ 423,892	$ (482,335)