Derivatives And Hedging (Schedule Of Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Total Derivatives in an asset position	$ 19,957	$ 8,764
Total Derivatives in a liability position	572	26,753
Natural Gas Future Contracts [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Derivatives in an asset position	19,957	6,448
Natural Gas Future Contracts [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Derivatives in a liability position	565	26,753
Financial Transmission Rights [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Derivatives in an asset position	0	2,316
Financial Transmission Rights [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Derivatives in a liability position	$ 7	$ 0

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-9

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant