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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative [Line Items] |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | $ 0 | $ (21,557) | $ 0 | $ (115,288)
Natural gas revenues |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | 0 | (21,427) | 0 | (114,304)
Crude oil and condensate revenues |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | 0 | (130) | 0 | (984)
Commodity contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion) | $ 0 | $ 0 | $ 0 | $ (133,310)

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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 + Details
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