Investments (Schedule Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule of Invested Securities [Line Items]
Equity, Cost	$ 2,158	$ 2,149
Equity Method Investment Gross Unrealized Gains	2,182	2,370
Equity, Fair Value	4,340	4,519
Other, Cost	2,396	2,306
Other Gross Unrealized Gains	2,223	2,425
Other, Fair Value	4,619	4,731
Total Other	2,437	2,361
Total Investments	227,700	279,019
Total Nuclear Decommissioning Trust	225,263	276,658
Nuclear Decommissioning Trust [Member]
Schedule of Invested Securities [Line Items]
Investments, Debt securities, Cost	86,770	84,701
Investments, Debt securities, Gross Unrealized Gains		4,052
Investments, Debt securities, Gross Unrealized Losses	(13,083)
Investments, Debt securities	73,687	88,753
Investments, Equity securities, Cost	93,878	92,916
Investments, Equity securities, Gross Unrealized Gains	64,139	94,923
Investments, Equity securities, Gross Unrealized Losses	(6,699)	(408)
Investments, Equity securities	151,318	187,431
Investments, Cash and other	258	474
Investments, Cost	180,906	178,091
Investments, Gross Unrealized Gains	64,139	98,975
Investments, Gross Unrealized Loss	(19,782)	(408)
Total Nuclear Decommissioning Trust	225,263	276,658
Other [Member]
Schedule of Invested Securities [Line Items]
Investments, Equity securities, Cost	238	157
Investments, Equity securities, Gross Unrealized Gains	41	55
Total Investments	$ 279	$ 212