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Derivatives - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) institution | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) institution | Sep. 30, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Loss (gain) on derivative contracts | $ 11,329 | $ 11,702 | $ 59,763 | $ (46,024)
Cash payments, upon settlement of derivative contract |  |  | $ 29,025 | (7,700)
Number of counterparties to open derivative contracts | institution | 5 |  | 5 |
Commodity Derivatives |  |  |  |
Derivative Instruments and Hedging Activities Disclosure |  |  |  |
Loss (gain) on derivative contracts | $ 11,300 | 11,700 | $ 59,800 | (46,000)
Cash payments, upon settlement of derivative contract | $ 11,600 | $ (5,000) | $ 29,000 | $ (7,700)

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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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