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Derivatives - Derivative Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure
(Gain) loss on commodity derivative contracts	$ 4,129	$ 5,299	$ 4,129	$ (7,168)
Cash (paid) received on settlements			0	11,197
Commodity derivative contracts
Derivative Instruments and Hedging Activities Disclosure
(Gain) loss on commodity derivative contracts	4,129	5,299	4,129	(7,168)
Cash (paid) received on settlements	$ 0	$ 619	$ 0	$ 11,197

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- Definition

Derivative Instruments and Hedging Activities Disclosure [Line Items]

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- Definition

Payments For (Proceeds From) Derivative Instruments Operating Activities

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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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=125515794&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=125515794&loc=SL5624171-113959

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