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Properties and Equipment, Net - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Properties and Equipment |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  |  | $ 435,619,000 | $ 114,875,000 | $ 771,037,000
Capitalized exploratory well costs that have been capitalized for a period of one year or less | $ 0 | $ 0 | $ 10,600,000 | $ 0 | $ 0 | $ 10,600,000
Oil and gas properties | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |
Capital rate |  |  | 10.00% | 10.00% |  |
West Virginia and Virginia |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |
Impairment of oil and gas properties and other assets | 435,600,000 |  |  |  |  |
West Virginia and Virginia | Oil and gas properties, proved and unproved |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |
Sale of oil and gas properties before closing adjustments | $ 89,200,000 |  |  |  |  |
South Texas, East Texas and Louisiana |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  | 114,900,000 |  |  |  |
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 |  | $ 89,900,000 |  |  |  |
East And South Texas |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |
Impairment of oil and gas properties and other assets |  |  | $ 771,000,000 |  |  |
East And South Texas | Oil and gas properties, proved and unproved |  |  |  |  |  |
Properties and Equipment |  |  |  |  |  |
Sale of oil and gas properties before closing adjustments |  |  | $ 86,500,000 |  |  |

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- Definition The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling. + References No definition available. + Details
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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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=64862545&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=66902209&loc=d3e3602-108585 + Details
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