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Long-term Debt - Narrative (Details) - USD ($)
1 Months Ended 5 Months Ended 7 Months Ended 12 Months Ended
Aug. 19, 2020
Jun. 23, 2020
Aug. 14, 2018
Aug. 03, 2018
May 31, 2020
Dec. 31, 2018
Aug. 13, 2018
Dec. 31, 2020
Dec. 31, 2019
Jul. 16, 2019
Debt Instrument [Line Items]                    
Principal               $ 2,769,400,000    
Loss on extinguishment of debt           $ 0 $ 0 861,000 $ 0  
Bank credit facility                    
Debt Instrument [Line Items]                    
Principal               500,000,000 $ 1,250,000,000  
Bank credit facility     $ 700,000,000.0             $ 1,600,000,000
Committed borrowing base               $ 1,400,000,000    
Debt, Weighted Average Interest Rate               3.48% 4.69%  
Minimum | Bank credit facility                    
Debt Instrument [Line Items]                    
Commitment fee on unused borrowing base     0.375%              
Leverage ratio     100.00%              
Current ratio     100.00%              
Maximum | Bank credit facility                    
Debt Instrument [Line Items]                    
Commitment fee on unused borrowing base     0.50%              
Leverage ratio     400.00%              
Current ratio     100.00%              
LIBOR | Minimum | Bank credit facility                    
Debt Instrument [Line Items]                    
Spread rate for interest rate on credit facility     2.25%              
LIBOR | Maximum | Bank credit facility                    
Debt Instrument [Line Items]                    
Spread rate for interest rate on credit facility     3.25%              
Base Rate | Minimum | Bank credit facility                    
Debt Instrument [Line Items]                    
Spread rate for interest rate on credit facility     1.25%              
Base Rate | Maximum | Bank credit facility                    
Debt Instrument [Line Items]                    
Spread rate for interest rate on credit facility     2.25%              
9¾% Senior Notes Due 2026                    
Debt Instrument [Line Items]                    
Principal               $ 1,650,000,000 $ 850,000,000  
Interest rate on debt instrument       9.75%       9.00%    
Proceeds of issued senior notes $ 296,400,000 $ 441,100,000   $ 815,900,000            
Debt instrument, face amount $ 300,000,000.0 $ 500,000,000.0   $ 850,000,000.0            
7½% Senior Notes Due 2025                    
Debt Instrument [Line Items]                    
Principal               $ 619,400,000 $ 625,000,000  
Early repayment of senior debt         $ 5,600,000          
Principal amount of long term debt retired         4,200,000          
Loss on extinguishment of debt         $ 900,000          
7½% Senior Notes Due 2025 | Common Stock                    
Debt Instrument [Line Items]                    
Debt conversion, converted instrument, shares of common stock issued (in shares)         767,096          
Amount of debt converted         $ 5,000,000.0          
7½% Senior Notes Due 2025 | Covey Park Equity Owners                    
Debt Instrument [Line Items]                    
Interest rate on debt instrument               7.00%   7.50%
Debt assumed in merger                   $ 625,000,000.0
Fair value of notes                   $ 446,600,000