Derivatives And Hedging (Schedule Of Fair Value Of Derivative Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Total derivatives in an asset position	$ 441	$ 59,902
Total derivatives in a liability position	77,001	8,721
Natural Gas Future Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total derivatives in an asset position	441	48,612
Natural Gas Future Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total derivatives in a liability position	76,000	8,721
Financial Transmission Rights [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total derivatives in an asset position		$ 11,290
Financial Transmission Rights [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total derivatives in a liability position	$ 1,001