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Properties and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Feb. 28, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  |  | $ 646,868 | $ 1,475
Impairment of oil and gas properties and other assets |  |  | $ 0 |  | $ 68,555 | 0 | 68,555
Loss on sale of assets |  |  | $ (544) |  | $ 1,403 | 40,505 | $ 1,626
Haynesville Shale | Oil and Gas Properties, Proved and Unproved |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  | $ 5,000 |  |  |
East Texas | Oil and Gas Properties, Proved and Unproved |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  | $ 765,000 |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  |  | $ 414,300 |  |  |
West Virginia, Virginia, and Ohio | Oil and Gas Properties, Proved and Unproved |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Loss on sale of assets |  |  |  |  |  | $ 44,200 |
Subsequent Event | Haynesville Shale | Oil and Gas Properties, Proved and Unproved |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets | $ 30,000 |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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