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Derivative Instruments - Notional Amounts of Derivative Instruments (Details) $ in Thousands, Mcf in Millions | 9 Months Ended | 12 Months Ended
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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 Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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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 + Details
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