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Derivative Instruments (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($) MWh | Mar. 31, 2021 USD ($)
Commodity Contract |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value at end of the period | $ (7,000) |
GSWC |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Description of derivative activity volume | MWh | 311,163 |
GSWC | Minimum | Commodity Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term of derivative contract | 3 years |
GSWC | Maximum | Commodity Contract |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Term of derivative contract | 5 years |
BVESI | Commodity Contract |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value at beginning of the period | $ 4,441 | $ (1,537)
Unrealized gains on purchased power contracts | 2,579 | 2,761
Fair value at end of the period | $ 7,020 | $ 1,224

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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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