Accounting for Derivative Instruments and Hedging Activities Contractual Contingent Liability (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 135,000
Electric Portfolio [Member]
Derivative [Line Items]
Fair Value Liability	31,571	$ 12,975
Posted Collateral	6,284	56,200
Additional Collateral, Aggregate Fair Value	1,878	3,157
Natural Gas Portfolio [Member]
Derivative [Line Items]
Posted Collateral	0
Electricity, US Regulated [Member]
Derivative [Line Items]
Posted Collateral	6,300
Credit Rating [Member] \| Electric Portfolio [Member]
Derivative [Line Items]
Fair Value Liability	1,878	3,157
Posted Collateral	0	0
Additional Collateral, Aggregate Fair Value	1,878	3,157
Credit Rating [Member] \| Natural Gas Portfolio [Member] \| Standby Letters of Credit
Derivative [Line Items]
Posted Collateral	6,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	50,000
Requested Credit for Adequate Assurance [Member] \| Electric Portfolio [Member]
Derivative [Line Items]
Fair Value Liability	28,717	4,157
Posted Collateral	0	0
Additional Collateral, Aggregate Fair Value	0	0
Forward Value of Contract [Member] \| Electric Portfolio [Member]
Derivative [Line Items]
Fair Value Liability	976	5,661
Posted Collateral	$ 6,284	$ 56,200

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959

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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.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959

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- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

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- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

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