Investments (Schedule Of Investments) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Schedule of Invested Securities [Line Items]
Available for sale investments, Debt securities	$ 48,273
Held to maturity investments, Cost	105,265	$ 104,514
Trading, Cost	198	198
Trading, Gross Unrealized Gains	59	49
Total Investments	257	247
Equity, Cost	2,171	2,142
Equity Method Investment Gross Unrealized Gains	2,036	2,012
Equity, Fair Value	4,207	4,154
Other, Cost	2,369	2,340
Other Gross Unrealized Gains	2,095	2,061
Other, Fair Value	4,464	4,401
Total Other	2,428	2,389
Held to maturity Investments	109,998	108,724
Total Investments	278,707	270,268
Available for sale investments, Cost	121,407	119,937
Total Nuclear Decommissioning Trust	166,281	159,155
Government Obligations [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Gross Unrealized Gains		1
Held to maturity Investments	2,338	2,000
Held to maturity investments, Gross Unrealized Losses	(4)
Held to maturity investments, Fair Value	2,334	2,001
Debt Securities [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Gross Unrealized Gains	4	6
Held to maturity Investments	2,395	2,210
Held to maturity investments, Fair Value	2,399	2,216
Unrestricted Investments [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Gross Unrealized Gains	4	7
Held to maturity Investments	4,733	4,210
Held to maturity investments, Gross Unrealized Losses	(4)
Held to maturity investments, Fair Value	4,733	4,217
Nuclear Decommissioning Trust [Member]
Schedule of Invested Securities [Line Items]
Available for sale investments, Debt securities, Cost	44,349	44,086
Available for sale investments, Debt securities, Gross Unrealized Gains	3,924	3,537
Available for sale investments, Debt securities	48,273	47,623
Available for sale investments, Equity securities, Cost	76,590	75,332
Available for sale investments, Equity securities, Gross Unrealized Gains	40,950	35,958
Available for sale Securities, Equity securities, Gross Unrealized Losses		(277)
Available for sale investments, Equity securities	117,540	111,013
Available for sale investments, Cash and other	468	519
Available for sale investments, Cost	121,407	119,937
Available for sale investments, Gross Unrealized Gains	44,874	39,495
Available-for-sale Securities, Gross Unrealized Loss		(277)
Total Nuclear Decommissioning Trust	166,281	159,155
Lease Deposits [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Cost	105,265	104,514
Held to maturity investments, Gross Unrealized Gains	2,498	2,948
Held to maturity investments, Fair Value	107,763	107,462
Lease Deposits [Member] \| Government Obligations [Member]
Schedule of Invested Securities [Line Items]
Held to maturity investments, Cost	105,265	104,514
Held to maturity investments, Gross Unrealized Gains	2,498	2,948
Held to maturity investments, Fair Value	$ 107,763	$ 107,462

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