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Derivative Instruments - Notional Amounts of Derivative Instruments (Details) $ in Thousands, Mcf in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) Mcf	Dec. 31, 2020 USD ($) Mcf
Commodity Member
Derivative [Line Items]
Notional amount (in bcf)	1,728.5	1,256.9
Basis Swap
Derivative [Line Items]
Notional amount (in bcf)	1,239.4	1,294.1
Interest Rate Swap
Derivative [Line Items]
Derivative notional amount | $	$ 410,000	$ 569,972
Basis Swap Purchased
Derivative [Line Items]
Notional amount (in bcf)	3.4

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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