Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 02, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed expected tax benefit	$ 69,125	$ (32,635)	$ (53,431)	$ (18,380)
State and foreign income taxes	6,217	(17,893)	5,026	(7,444)
Valuation allowance	(46,208)	0	19,024	24,638
Gain on Settlement of Liabilities Subject to Compromise	(89,905)	0	0	0
Reduction in value of assets	87,316	19,154	0	(233)
Fresh Start Adjustments	29,099	0	0	0
Other	4,359	(1,924)	2,493	4,152
Income tax (expense) benefit	$ 60,003	$ (33,298)	$ (26,888)	$ 2,733