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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

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