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Derivative Instruments - Designated and Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Derivatives not designated as hedging instruments |  |  |  |
Amount recognized in (loss) gain on derivatives not designated as hedges |  |  | $ (125,698) | $ 47,851
Not designated as hedging instrument |  |  |  |
Derivatives not designated as hedging instruments |  |  |  |
Amount recognized in (loss) gain on derivatives not designated as hedges | $ (234,693) | $ 4,259 | (125,698) | 47,851
Cash flow hedging | Designated as hedging instrument | Commodity derivatives |  |  |  |
Commodity/Interest rate derivatives designated as cash flow hedges |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI, net of tax (effective portion) | 15,940 | 42,581 | 28,364 | 83,332
Cash flow hedging | Designated as hedging instrument | Interest rate derivatives |  |  |  |
Commodity/Interest rate derivatives designated as cash flow hedges |  |  |  |
Amount of gain (loss) reclassified from accumulated OCI, net of tax (effective portion) | $ (36) | $ (36) | $ (72) | $ (72)

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and 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 (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of price risk derivatives not designated 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=64837297&loc=SL5624171-113959 + Details
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