Investments (Schedule Of Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Invested Securities [Line Items]
Equity, Cost	$ 2,177	$ 2,158
Equity Method Investment Gross Unrealized Gains	2,262	2,182
Equity, Fair Value	4,439	4,340
Other, Cost	2,302	2,396
Other Gross Unrealized Gains	2,274	2,223
Other, Fair Value	4,576	4,619
Total Other	2,314	2,437
Total Investments	262,921	227,700
Total Nuclear Decommissioning Trust	260,607	225,263
Nuclear Decommissioning Trust [Member]
Schedule of Invested Securities [Line Items]
Investments, Debt securities, Cost	89,587	86,770
Investments, Debt securities, Gross Unrealized Losses	(11,626)	(13,083)
Investments, Debt securities	77,961	73,687
Investments, Equity securities, Cost	97,056	93,878
Investments, Equity securities, Gross Unrealized Gains	90,539	64,139
Investments, Equity securities, Gross Unrealized Losses	(5,231)	(6,699)
Investments, Equity securities	182,364	151,318
Investments, Cash and other	282	258
Investments, Cost	186,925	180,906
Investments, Gross Unrealized Gains	90,539	64,139
Investments, Gross Unrealized Losses	(16,857)	(19,782)
Total Nuclear Decommissioning Trust	260,607	225,263
Other [Member]
Schedule of Invested Securities [Line Items]
Investments, Equity securities, Cost	125	238
Investments, Equity securities, Gross Unrealized Gains	12	41
Total Investments	$ 137	$ 279