Derivatives And Hedging (Schedule Of Derivative Instruments On The Statement Of Revenues, Expenses, And Patronage Capital) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Regulatory Asset/Liability for Derivatives	$ (79,991)	$ 48,738
Amount Of Gain (Loss) Reclassified from Regulatory Asset/Liability into Income	(80,490)	144,157
Natural Gas Future Contracts [Member] | Fuel [Member] | Operating Expense Fuel [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Regulatory Asset/Liability for Derivatives	(78,990)	37,448
Amount Of Gain (Loss) Reclassified from Regulatory Asset/Liability into Income	(68,613)	123,256
Financial Transmission Rights [Member] | Purchased Power [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Regulatory Asset/Liability for Derivatives	(1,001)	11,290
Amount Of Gain (Loss) Reclassified from Regulatory Asset/Liability into Income	$ (11,877)	$ 20,901