Investments (Schedule Of Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Schedule of Invested Securities [Line Items]
Equity, Cost	$ 2,177	$ 2,177
Equity Method Investment Gross Unrealized Gains	2,192	2,262
Equity, Fair Value	4,369	4,439
Other, Cost	2,258	2,302
Other Gross Unrealized Gains	2,214	2,274
Other, Fair Value	4,472	4,576
Total Other	2,280	2,314
Total Investments	282,196	262,921
Total Nuclear decommissioning trust	279,916	260,607
Nuclear Decommissioning Trust [Member]
Schedule of Invested Securities [Line Items]
Investments, Debt securities, Cost	106,177	89,587
Investments, Debt securities, Gross Unrealized Losses	(14,103)	(11,626)
Investments, Debt securities	92,074	77,961
Investments, Equity securities, Cost	94,194	97,056
Investments, Equity securities, Gross Unrealized Gains	98,399	90,539
Investments, Equity securities, Gross Unrealized Losses	(4,916)	(5,231)
Investments, Equity securities	187,677	182,364
Investments, Cash and other	165	282
Investments, Cost	200,536	186,925
Investments, Gross Unrealized Gains	98,399	90,539
Investments, Gross Unrealized Losses	(19,019)	(16,857)
Total Nuclear decommissioning trust	279,916	260,607
Other [Member]
Schedule of Invested Securities [Line Items]
Investments, Equity securities, Cost	81	125
Investments, Equity securities, Gross Unrealized Gains	22	12
Total Investments	$ 103	$ 137