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Properties and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Feb. 29, 2016 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  | $ 32,711 | $ 49,068
Impairment of oil and gas properties |  |  | $ 0 |  | $ 0 | 68,555 | 0
Gain (loss) on sale of assets |  |  | $ (11,872) |  | $ (1,245) | $ (13,498) | $ (768)
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 |  |  |
Gain (loss) on sale of assets | $ (11,900) |  |  |  |  |  |
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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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466 Reference 3: 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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