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Financial Instruments And Investments (Long-Term Debt and Short-Term Borrowings - Narratives) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Nuclear Fuel Financing
Dec. 31, 2013
Nuclear Fuel Financing
Sep. 30, 2014
Working Capital and General Purpose
Dec. 31, 2013
Working Capital and General Purpose
Aug. 18, 2010
RGRT Senior Notes
Financial Instruments and Investments [Line Items]              
Debt Instrument, Face Amount             $ 110,000
Line of Credit Facility, Amount Outstanding     17,500 14,400 72,000 0  
Decommissioning Fund Investments $ 229,048 $ 214,095