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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on the Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | $ 17,364 | $ 71,906 | $ 44,668 | $ 69,577
Unrealized gain (loss) on derivative instruments |  |  | 44,668 | 69,577
Gain (loss) on derivative instruments | 17,364 | 50,349 | 44,668 | 25,064
Total | 17,364 | 50,349 | 44,668 | (45,711)
Derivatives Designated as Hedges |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | 0 | 0 | 0 | (70,775)
Derivatives Designated as Hedges | Natural gas revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | 0 | 0 | 0 | (70,557)
Derivatives Designated as Hedges | Crude oil and condensate revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | 0 | 0 | 0 | (218)
Derivatives Not Designated as Hedges |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Unrealized gain (loss) on derivative instruments | (27,733) | 31,833 | (89,159) | 44,766
Derivatives Not Designated as Hedges | Natural gas revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | 0 | (21,427) | 0 | (43,747)
Derivatives Not Designated as Hedges | Crude oil and condensate revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | 0 | (130) | 0 | (766)
Derivatives Not Designated as Hedges | Gain (loss) on derivative instruments |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Gain (loss) on derivative instruments | $ 45,097 | $ 40,073 | $ 133,827 | $ 24,811

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: 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=56944662&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + 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=56944662&loc=d3e3602-108585 + Details
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