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Assets Held for Sale - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Impairment of Oil and Gas Properties | $ 46,109,000 | $ 47,238,000 | $ 1,168,000
Oil and gas properties | 120,926,000 |  |
Less: accumulated depreciation, depletion, amortization and impairment | 94,198,000 |  |
Total assets | 26,728,000 | 0 |
Asset retirement obligation | (10,228,000) |  |
Total liabilities | (10,228,000) |  |
Net assets | $ 16,500,000 |  |
Proved oil and gas properties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment of Oil and Gas Properties |  | $ 40,000,000 | $ 0

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- Definition Assets Held-for-Sale, Accumulated Depreciation, Depletion, Amortization and Impairment + References No definition available. + Details
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- Definition Assets Held For Sale, Long Lived, Net of Liabilities + References No definition available. + Details
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2510-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 + Details
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