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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax (benefit) expense | $ 315,815,000 | $ (144,047,000) | $ (179,331,000) | $ 0 | $ 0 | $ 0 | $ 0 | $ (69,000) | $ (7,563,000) | $ (69,000.0) | $ 1,809,000
Valuation allowance increase (decrease) |  |  |  |  |  |  |  |  | (439,500,000) | 86,800,000 | 347,000,000.0
Foreign tax credit carryforwards | 943,000 |  |  |  | 2,009,000 |  |  |  | 943,000 | 2,009,000 | 2,074,000
Valuation allowance of deferred tax assets | 647,575,000 |  |  |  | 211,987,000 |  |  |  | 647,575,000 | 211,987,000 | 298,830,000
Impairment of oil and natural gas properties |  |  |  |  |  |  |  |  | 2,039,770,000 | 0 | $ 0
Uncertain tax position liability | 3,127,000 |  |  |  | $ 3,127,000 |  |  |  | 3,127,000 | $ 3,127,000 |
Federal |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforward | 1,300,000,000 |  |  |  |  |  |  |  | 1,300,000,000 |  |
State |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards, subject to expiration | $ 244,500,000 |  |  |  |  |  |  |  | $ 244,500,000 |  |

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