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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Commodity derivative contracts, assets, net of offset | $ 119,566 | $ 338,417
Commodity derivative contracts, liabilities, net of offset | 695 | 0
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Netting adjustment, assets | (2,741) | 0
Commodity derivative contracts, assets, net of offset | 119,566 | 338,417
Investments | 10,444 | 11,106
Assets measured at fair value | 130,010 | 349,523
Netting adjustments, liabilities | (2,741) | 0
Commodity derivative contracts, liabilities, net of offset | 695 |
Long-term debt holder conversion feature | 5,474 |
Guarantee |  | 5,104
Liabilities measured at fair value | 6,169 | 5,104
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Commodity derivative contracts, assets, before netting | 0 | 0
Investments | 10,444 | 11,106
Assets measured at fair value | 10,444 | 11,106
Commodity derivative contracts, liabilities, before netting | 0 |
Long-term debt holder conversion feature | 0 |
Guarantee |  | 0
Liabilities measured at fair value | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Commodity derivative contracts, assets, before netting | 122,307 | 338,067
Investments | 0 | 0
Assets measured at fair value | 122,307 | 338,067
Commodity derivative contracts, liabilities, before netting | 0 |
Long-term debt holder conversion feature | 0 |
Guarantee |  | 0
Liabilities measured at fair value | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Commodity derivative contracts, assets, before netting | 0 | 350
Investments | 0 | 0
Assets measured at fair value | 0 | 350
Commodity derivative contracts, liabilities, before netting | 3,436 |
Long-term debt holder conversion feature | 5,474 |
Guarantee |  | 5,104
Liabilities measured at fair value | $ 8,910 | $ 5,104

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226003-175313 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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