Investments (Schedule Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Schedule of Invested Securities [Line Items]
Available for sale investments, Debt securities	$ 47,623
Held to maturity investments, Cost	104,514	$ 101,816
Trading, Cost	198	175
Trading, Gross Unrealized Gains	49	36
Total Investments	247	211
Equity, Cost	2,142	2,190
Equity Method Investment Gross Unrealized Gains	2,012	1,978
Equity, Fair Value	4,154	4,168
Other, Cost	2,340	2,365
Other Gross Unrealized Gains	2,061	2,014
Other, Fair Value	4,401	4,379
Total Other	2,389	2,401
Held to maturity Investments	108,724	106,508
Total Investments	270,268	254,624
Available for sale investments, Cost	119,937	115,324
Total Nuclear Decommissioning Trust	159,155	145,715
Government Obligations [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Gross Unrealized Gains	1
Held to maturity Investments	2,000	2,003
Held to maturity investments, Gross Unrealized Losses		(2)
Held to maturity investments, Fair Value	2,001	2,001
Unrestricted Investments [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Gross Unrealized Gains	7
Held to maturity Investments	4,210	4,692
Held to maturity investments, Gross Unrealized Losses		(7)
Held to maturity investments, Fair Value	4,217	4,685
Debt Securities [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Gross Unrealized Gains	6
Held to maturity Investments	2,210	2,689
Held to maturity investments, Gross Unrealized Losses		(5)
Held to maturity investments, Fair Value	2,216	2,684
Nuclear Decommissioning Trust [Member]
Schedule of Invested Securities [Line Items]
Available for sale investments, Debt securities, Cost	44,086	42,898
Available for sale investments, Debt securities, Gross Unrealized Gains	3,537	2,940
Available for sale investments, Debt securities	47,623	45,838
Available for sale investments, Equity securities, Cost	75,332	72,213
Available for sale investments, Equity securities, Gross Unrealized Gains	35,958	29,164
Available for sale Securities, Equity securities, Gross Unrealized Losses	(277)	(1,713)
Available for sale investments, Equity securities	111,013	99,664
Available for sale investments, Cash and other	519	213
Available for sale investments, Cost	119,937	115,324
Available for sale investments, Gross Unrealized Gains	39,495	32,104
Available-for-sale Securities, Gross Unrealized Loss	(277)	(1,713)
Total Nuclear Decommissioning Trust	159,155	145,715
Lease Deposits [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Cost	104,514	101,816
Held to maturity investments, Gross Unrealized Gains	2,948	4,428
Held to maturity investments, Fair Value	107,462	106,244
Lease Deposits [Member] \| Government Obligations [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Cost	104,514	101,816
Held to maturity investments, Gross Unrealized Gains	2,948	4,428
Held to maturity investments, Fair Value	$ 107,462	$ 106,244

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