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Financial Instruments And Investments (Long-Term Debt And Short-Term Borrowings - Narratives) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
May. 01, 2005
Financial Instruments and Investments [Line Items]      
Interest Rate Cash Flow Hedge Loss to be Reclassified During Next 12 Months, Net $ 500    
Decommissioning Fund Investments 239,035 $ 234,286  
Nuclear Fuel Financing      
Financial Instruments and Investments [Line Items]      
Line of Credit Facility, Amount Outstanding 33,700 14,500  
Working Capital and General Purpose      
Financial Instruments and Investments [Line Items]      
Line of Credit Facility, Amount Outstanding $ 108,000 $ 0  
Senior Notes | 6.00% Senior Notes, Net of Discount, due 2035      
Financial Instruments and Investments [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.00% 6.00% 6.00%
RGRT Senior Notes      
Financial Instruments and Investments [Line Items]      
Long-term Debt, Gross $ 95,000 $ 110,000