Investments (Schedule Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Invested Securities [Line Items]
Equity, Cost	$ 2,149	$ 2,145
Equity Method Investment Gross Unrealized Gains	2,370	2,340
Equity, Fair Value	4,519	4,485
Other, Cost	2,306	2,277
Other Gross Unrealized Gains	2,425	2,374
Other, Fair Value	4,731	4,651
Total Other	2,361	2,311
Total Investments	279,019	244,648
Total Nuclear Decommissioning Trust	276,658	242,337
Nuclear Decommissioning Trust [Member]
Schedule of Invested Securities [Line Items]
Investments, Debt securities, Cost	84,701	66,727
Investments, Debt securities, Gross Unrealized Gains	4,052	7,493
Investments, Debt securities	88,753	74,220
Investments, Equity securities, Cost	92,916	89,472
Investments, Equity securities, Gross Unrealized Gains	94,923	76,828
Investments, Equity securities, Gross Unrealized Losses	(408)
Investments, Equity securities	187,431	166,300
Investments, Cash and other	474	1,817
Investments, Cost	178,091	158,016
Investments, Gross Unrealized Gains	98,975	84,321
Investments, Gross Unrealized Loss	(408)
Total Nuclear Decommissioning Trust	276,658	242,337
Other [Member]
Schedule of Invested Securities [Line Items]
Investments, Equity securities, Cost	157	132
Investments, Equity securities, Gross Unrealized Gains	55	34
Total Investments	$ 212	$ 166