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Derivatives - Derivative Activity (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) institution	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) institution	Sep. 30, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosure
(Gain) loss on derivative contracts	$ 5,299	$ (1,756)	$ (7,168)	$ (1,547)
Cash received on settlements			$ 11,197	5,700
Number of counterparties to open derivative contracts | institution	3		3
Commodity derivative contracts
Derivative Instruments and Hedging Activities Disclosure
(Gain) loss on derivative contracts	$ 5,299	(1,756)	$ (7,168)	(1,547)
Cash received on settlements	$ (619)	$ (622)	$ (11,197)	$ (5,700)

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Derivative Instruments and Hedging Activities Disclosure [Line Items]

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Payments For (Proceeds From) Derivative Instruments Operating Activities

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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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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