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Derivatives - Narrative (Details) $ in Thousands	3 Months Ended
	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

Derivative Instruments and Hedging Activities Disclosure [Line Items]

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Number Of Counterparties To Open Derivative Contracts

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The net cash outflow or inflow from derivatives instruments during the period, which are classified as operating activities, excluding those designated as hedging instruments.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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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

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