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Unevaluated Property (Summary of Unevaluated Properties Excluded from Amortization) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 18, 2020
Dec. 31, 2020
Dec. 31, 2021
Summary of unevaluated properties excluded from oil and natural gas properties being amortized      
Property acquisition costs $ 68,103 [1] $ 0 $ 0
Exploration and development 0 46 39,481
Capitalized interest 0 963 3,576
Total 68,103 [1] 1,009 43,057
Property acquisition costs     68,103
Exploration and development     39,527
Capitalized interest     4,539
Total $ 111,983 $ 85,304 $ 112,169
[1] Reflects the carrying values of our unevaluated properties as a result of the application of fresh start accounting upon emergence from bankruptcy (see Note 2, Fresh Start Accounting, for additional information) that remain in unevaluated properties as of December 31, 2021.