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Unevaluated Property (Summary of Unevaluated Properties Excluded from Amortization) (Details) - USD ($)
3 Months Ended
Sep. 18, 2020
Dec. 31, 2020
Dec. 31, 2019
Summary of unevaluated properties excluded from oil and natural gas properties being amortized      
Property acquisition costs $ 84,019,000 [1] $ 0  
Exploration and development 0 46,000  
Capitalized interest 0 1,239,000  
Total $ 84,019,000 [1] 1,285,000  
Property acquisition costs   84,019,000  
Exploration and development   46,000  
Capitalized interest   1,239,000  
Total   $ 85,304,000 $ 872,910,000
[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, 2020.