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Derivatives - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Institution | Sep. 30, 2014 USD ($)
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Number of counterparties to open derivative contracts | Institution |  |  | 9 |
Gain on derivative contracts | $ (42,211) | $ (132,575) | $ (59,034) | $ (4,792)
Commodity Derivatives |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Gain on derivative contracts | (42,200) | (132,600) | (59,000) | (4,800)
Commodity Derivatives | Cash |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Gain on derivative contracts | $ (67,300) | $ (3,400) | $ (278,600) | 92,900
Early Settlements | Commodity Derivatives | Cash |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Gain on derivative contracts |  |  |  | $ 69,600
Lenders of Senior Credit Facility |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Number of counterparties to open derivative contracts | Institution |  |  | 4 |

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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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