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Properties and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Feb. 29, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  | $ 1,475 | $ 49,828 |
Oil and gas properties, net | $ 4,202,985 |  | $ 4,202,985 |  | 4,202,985 |  | $ 4,250,125
Asset retirement obligations | 57,502 |  | 57,502 |  | 57,502 |  | $ 131,733
Gain (loss) on sale of assets |  |  | $ (1,403) | $ (878) | $ (1,626) | $ 477 |
West Virginia, Virginia, and Ohio | Oil and Gas Properties, Proved and Unproved |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets | 41,300 |  |  |  |  |  |
Impairment of oil and gas properties | $ 68,600 |  |  |  |  |  |
East Texas | Oil and Gas Properties, Proved and Unproved |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  | $ 56,400 |  |  |  |  |
Gain (loss) on sale of assets |  | $ 500 |  |  |  |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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