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Derivative Accounting - Gains and Losses from Derivative Instruments (Details) - Commodity Contracts - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
Amount reclassified from accumulated other comprehensive income to earnings related to discontinued cash flow hedges | $ 0 | $ 0 | $ 0
Fuel and purchased power | Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
Loss reclassified from accumulated other comprehensive income into income (effective portion realized) | 0 | (763) | (1,512)
Fuel and purchased power | Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | $ 216,847 | $ (3,178) | $ (84,953)

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