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Derivative Instruments - Notional Amounts of Derivative Instruments (Details) - Mcf Mcf in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Natural Gas Commodity Swaps (Bcf) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | 1,256,900 | 1,460,600
Natural Gas Basis Swaps (Bcf) |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | 1,294,100 | 1,290,400
Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative notional amount | 569,972 | 160,000

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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 No definition available. + Details
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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