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Derivatives - Narrative (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($) institution | Mar. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure |  |
Loss (gain) on derivative contracts | $ 18,330 | $ (34,183)
Cash payments, upon settlement of derivative contract | $ 6,119 | 638
Number of counterparties to open derivative contracts | institution | 5 |
Commodity Derivatives |  |
Derivative Instruments and Hedging Activities Disclosure |  |
Loss (gain) on derivative contracts | $ 18,300 | (34,200)
Cash payments, upon settlement of derivative contract | $ 6,100 | $ 600

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- Definition Number Of Counterparties To Open Derivative Contracts + 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=84234895&loc=SL5624171-113959 + Details
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