STATEMENTS OF CONSOLIDATED EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Warrants [Member]	Additional Paid in Capital [Member]	Treasury Stock [Member]	Accumulated Earnings (Deficit) [Member]
Balance at Dec. 31, 2018	$ 416,558	$ 3	$ 4,788	$ 355,872	$ 0	$ 55,895
Net income (loss)	(35,197)	0	0	0	0	(35,197)
Equity transactions related to the Merger	91,544	206	2	94,059	(2,723)	0
Acquisition of treasury stock	(618)	0	0	0	(618)	0
Retirement of treasury shares	0	0	0	(3,341)	3,341	0
Share-based compensation expense	4,530	0	0	4,530	0	0
Cost incurred in conjunction with tender offer	(107)	0	0	(107)	0	0
Common stock repurchased and retired under the share repurchase program	(26,203)	0	0	(26,203)	0	0
Dividends	(15,889)	0	0	0	0	(15,889)
Restricted shares returned to plan and retired	(406)	0	0	(406)	0	0
Other	(5)	0	0	(5)	0	0
Balance at Dec. 31, 2019	434,207	209	4,790	424,399	0	4,809
Net income (loss)	(464,030)	0	0	0	0	(464,030)
Share-based compensation expense	(112)	0	0	(112)	0	0
Dividends	(3,786)	0	0	0	0	(3,786)
Expiration Of Warrants	0	0	(2)	2	0	0
Restricted shares returned to plan and retired	(51)	0	0	(51)	0	0
Other	35	169	0	(134)	0	0
Balance at Dec. 31, 2020	$ (33,737)	$ 378	$ 4,788	$ 424,104	$ 0	$ (463,007)