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Debt (Schedule Of Long Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Feb. 02, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt, gross			$ 1,300,000
liabilities subject to compromise			1,335,794
Unamortized debt issuance costs
Total debt, net
Revision of Prior Period, Reclassification, Adjustment [Member]
Debt Instrument [Line Items]
liabilities subject to compromise			(1,300,000)
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Total debt, gross			$ 500,000
Stated interest rate	7.75%	7.75%	7.75%
New Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Total debt, gross			$ 800,000
Stated interest rate	7.125%	7.125%	7.125%
Original Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate	7.125%