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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income on Discontinuation | $ 0 | $ 0 | $ 0
Fuel and purchased power | Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | 307,287 | 216,847 | (3,178)
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 | $ 0 | $ (763)

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- Definition The net gain (loss) reclassified from accumulated other comprehensive income into income on discontinuation of derivative instruments designated and qualifying as hedging instruments. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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