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Accounting For Income Taxes (Schedule Of Components Of Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Expense (Benefit) [Line Items]
Current income tax expense (benefit)	$ (67,059)us-gaap_CurrentIncomeTaxExpenseBenefit	$ 37,743us-gaap_CurrentIncomeTaxExpenseBenefit	$ 18,710us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense	144,269us-gaap_DeferredIncomeTaxExpenseBenefit	23,532us-gaap_DeferredIncomeTaxExpenseBenefit	21,449us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	72,240us-gaap_IncomeTaxExpenseBenefit	58,014us-gaap_IncomeTaxExpenseBenefit	39,764us-gaap_IncomeTaxExpenseBenefit
Utility and Other (Excluding Ecova) [Member]
Components of Income Tax Expense (Benefit) [Line Items]
Deferred income tax expense	$ 139,299	$ 20,271	$ 21,054

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.