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Divestitures - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Feb. 29, 2016 | Jun. 30, 2017 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Acquisitions and Disposals |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  | $ (11,565) | $ (1,857) | $ 3,866
Proceeds from sale of assets |  |  |  |  | 115,444 | 50,419 | 7,653
Impairment of oil and gas properties and other assets |  |  |  |  | $ 482,811 | $ 435,619 | $ 114,875
Oil and gas properties, proved and unproved | West Virginia, Virginia, and Ohio |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |
Gain (loss) on sale of assets | $ (11,900) |  |  |  |  |  |
Proceeds from sale of assets | $ 41,300 |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  | $ 68,600 |  |  |  |
Oil and gas properties, proved and unproved | East Texas |  |  |  |  |  |  |
Significant Acquisitions and Disposals |  |  |  |  |  |  |
Gain (loss) on sale of assets |  | $ 500 |  |  |  |  |
Proceeds from sale of assets |  | $ 56,400 |  | $ 6,300 |  |  |

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