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Divestitures - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Significant Acquisitions and Disposals |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  | $ (491) | $ (1,462) | $ (16,327)
Proceeds from sale of assets |  |  |  | $ 828 | $ 2,600 | $ 678,350
Oil and Gas Properties, Proved and Unproved | Haynesville Shale |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | $ 29,700 |  |  |
Proceeds from sale of assets | $ 30,000 |  | 5,000 |  |  |
Oil and Gas Properties, Proved and Unproved | Eagle Ford Shale |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | (45,400) |  |  |
Proceeds from sale of assets |  | $ 765,000 | 76,500 |  |  |
Impairment of oil and gas properties |  |  | $ 414,300 |  |  |

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