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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 | Sep. 30, 2017 | Feb. 29, 2016 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |  |  |  |
Loss on sale of assets |  |  |  |  |  |  |  |  | $ 16,327 | $ 11,565 | $ 1,857
Proceeds from sale of assets |  |  |  |  |  |  |  |  | 678,350 | 115,444 | 50,419
Impairment of oil and gas properties |  |  |  |  |  |  |  |  | $ 0 | $ 482,811 | $ 435,619
Oil and gas properties, proved and unproved | Haynesville Shale |  |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Loss on sale of assets |  |  |  |  | $ 45,400 |  |  |  |  |  |
Proceeds from sale of assets |  | $ 765,000 |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties |  |  |  |  |  | $ 414,300 |  |  |  |  |
Oil and gas properties, proved and unproved | West Virginia, Virginia, and Ohio |  |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |  |  |  |
Loss on sale of assets |  |  | $ 11,900 |  |  |  |  |  |  |  |
Proceeds from sale of assets |  |  | $ 41,300 |  |  |  |  |  |  |  |
Impairment of oil and gas properties |  |  |  |  |  |  | $ 68,600 |  |  |  |
Oil and gas properties, proved and unproved | East Texas |  |  |  |  |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |  |  |  |  |
Loss on sale of assets |  |  |  | $ (500) |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  | $ 56,400 |  |  |  | $ 6,300 |  |  |

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