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Fresh Start Accounting (Details Textuals) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 18, 2020
Sep. 18, 2020
Dec. 31, 2020
Sep. 18, 2020
Reorganization Value [Line Items]          
Enterprise value   $ 1,280,856 $ 1,280,856   $ 1,280,856
Contractual interest expense on prepetition liabilities not recognized in statement of operations     22,000    
Cash outflow related to payment of professional service provider fees and success fees         12,700
DIP credit agreement fees         3,107
Capitalized costs of proved and unproved properties   $ 865,400 865,400   865,400
Expected annual dividend yield for warrants   0.00%      
Decrease to deferred taxes   $ 128,600 128,600   128,600
Decrease to deferred tax liabilities related to fresh start accounting adjustments   414,100 414,100   414,100
Stockholders' Equity, Period Increase (Decrease)   4,600     (5,331)
Minimum          
Reorganization Value [Line Items]          
Enterprise value   1,100,000 1,100,000   1,100,000
Useful life of intangible CO2 contracts 7 years     7 years  
Minimum | Pipelines          
Reorganization Value [Line Items]          
Useful life 20 years     20 years  
Maximum          
Reorganization Value [Line Items]          
Enterprise value   1,500,000 1,500,000   1,500,000
Useful life of intangible CO2 contracts 14 years     14 years  
Maximum | Pipelines          
Reorganization Value [Line Items]          
Useful life 43 years     43 years  
Median          
Reorganization Value [Line Items]          
Enterprise value   $ 1,300,000 $ 1,300,000   $ 1,300,000
Series A Warrants          
Reorganization Value [Line Items]          
Exercise price of warrants   $ 32.59 $ 32.59 $ 32.59 $ 32.59
Expected volatility of warrants   49.30%      
Risk free interest rate associated with warrants   0.30%      
Term of warrants   5 years 5 years   5 years
Series B Warrants          
Reorganization Value [Line Items]          
Exercise price of warrants   $ 35.41 $ 35.41 $ 35.41 $ 35.41
Expected volatility of warrants   53.60%      
Risk free interest rate associated with warrants   0.20%      
Term of warrants   3 years 3 years   3 years
Measurement Input, Share Price          
Reorganization Value [Line Items]          
Implied stock price   $ 22.14 $ 22.14   $ 22.14