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Properties and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 19, 2017 | Dec. 11, 2017
Properties and Equipment |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  |  |  | $ 482,811 | $ 435,619 | $ 114,875 |  |
Properties and equipment, net (Successful efforts method) | $ 3,072,204 | $ 4,250,125 |  |  | $ 3,072,204 | 4,250,125 |  |  |
Oil and gas properties | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Capital rate |  |  |  |  | 10.00% |  |  |  |
West Virginia, Virginia, and Ohio | Oil and gas properties, proved and unproved |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  |  | $ 68,600 |  |  |  |  |
South Texas, East Texas and Louisiana |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  | 435,600 |  |  |  |  |  |  |
Sale of oil and gas properties before closing adjustments |  | $ 89,200 |  |  |  | $ 89,200 |  |  |
South Texas, East Texas and Louisiana | Oil and gas properties, proved and unproved |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Sale of oil and gas properties before closing adjustments |  |  | $ 89,900 |  |  |  | $ 89,900 |  |
East And South Texas |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  | $ 114,900 |  |  |  |  |  |
Assets Held-for-sale |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Consideration | 762,195 |  |  |  | $ 762,195 |  |  |  |
Assets Held-for-sale | West Virginia, Virginia, and Ohio |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  |  | 68,600 |  |  |  |  |
Properties and equipment, net (Successful efforts method) |  |  |  | $ 37,900 |  |  |  |  |
Assets Held-for-sale | Haynesville |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  | $ 30,000
Assets Held-for-sale | Eagle Ford |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  | $ 765,000 |
Assets Held-for-sale | Eagle Ford | South Texas |  |  |  |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties and other assets | 414,300 |  |  |  |  |  |  |  |
Properties and equipment, net (Successful efforts method) | $ 765,600 |  |  |  | $ 765,600 |  |  |  |

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