Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock ($.001 Par Value)	Paid-In Capital in Excess of Par	Retained Earnings (Accumulated Deficit)	Treasury Stock (at cost)
Beginning balance, shares at Dec. 31, 2019		508,065,495			1,652,771
Beginning balance at Dec. 31, 2019	$ 1,412,259	$ 508	$ 2,739,099	$ (1,321,314)	$ (6,034)
Issued pursuant to stock compensation plans, shares		312,516
Issued pursuant to directors' compensation plan, shares		37,367
Stock-based compensation, value	3,204		3,204
Tax withholding for stock compensation plans, shares					175,673
Tax withholding for stock compensation plans, value	(34)				$ (34)
Net income (loss)	74,016			74,016
Ending balance, shares at Mar. 31, 2020		508,415,378			1,828,444
Ending balance at Mar. 31, 2020	1,489,445	$ 508	2,742,303	(1,247,298)	$ (6,068)
Canceled pursuant to stock compensation plans, shares		(6,218,868)
Canceled pursuant to stock compensation plans, value		$ (6)	6
Issued pursuant to notes conversion, shares		7,357,450
Issued pursuant to notes conversion, value	11,461	$ 8	11,453
Stock-based compensation, value	987		987
Net income (loss)	(697,474)			(697,474)
Ending balance, shares at Jun. 30, 2020		509,553,960			1,828,444
Ending balance at Jun. 30, 2020	804,419	$ 510	2,754,749	(1,944,772)	$ (6,068)
Canceled pursuant to stock compensation plans, shares		(95,016)
Issued pursuant to notes conversion, shares		14,800
Issued pursuant to notes conversion, value	40		40
Stock-based compensation, value	10,126		10,126
Tax withholding for stock compensation plans, shares					567,189
Tax withholding for stock compensation plans, value	(134)				$ (134)
Cancellation of Predecessor equity, shares		(509,473,744)			(2,395,633)
Cancellation of Predecessor equity, value	(5,331)	$ (510)	(2,764,915)	2,753,892	$ 6,202
Issuance of Successor equity, shares		49,999,999
Issuance of Successor equity, value	1,095,419	$ 50	1,095,369
Net income (loss)	(809,120)			(809,120)
Ending balance, shares at Sep. 18, 2020		49,999,999
Ending balance at Sep. 18, 2020	1,095,419	$ 50	1,095,369
Net income (loss)	2,758			2,758
Ending balance, shares at Sep. 30, 2020		49,999,999
Ending balance at Sep. 30, 2020	1,098,177	$ 50	1,095,369	2,758
Stock-based compensation, value	8,907		8,907
Net income (loss)	$ (53,416)			(53,416)
Ending balance, shares at Dec. 31, 2020	49,999,999	49,999,999
Ending balance at Dec. 31, 2020	$ 1,053,668	$ 50	1,104,276	(50,658)
Stock-based compensation, value	19,172		19,172
Tax withholding for stock compensation plans, value	(1,467)		(1,467)
Issued pursuant to exercise of warrants, shares		5,620
Issued pursuant to exercise of warrants, value	195	$ 0	195
Net income (loss)	$ (69,642)			(69,642)
Ending balance, shares at Mar. 31, 2021	50,005,619	50,005,619
Ending balance at Mar. 31, 2021	$ 1,001,926	$ 50	$ 1,122,176	$ (120,300)