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Fair Value (Reconciliation For All Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ (5,262) $ (16,409) $ (19,334) $ (27,000)
Included in regulatory assets/liabilities 5,353 (4,382) 659  
Settlements 5,794 7,307 7,007  
Transfers, Net 0 0 0  
Gain (Loss) Included in Earnings 0 0 0  
Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0  
Purchases 0 0 0  
Issuances 0 0 0  
Natural Gas Exchange Agreements [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance (2,774) (3,164) (5,885) (5,039)
Included in regulatory assets/liabilities 326 3,292 259  
Settlements 64 (571) (1,105)  
Transfers, Net 0 0 0  
Gain (Loss) Included in Earnings 0 0 0  
Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0  
Purchases 0 0 0  
Issuances 0 0 0  
Power Exchange Agreements [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance (2,488) (13,245) (13,449) $ (21,961)
Included in regulatory assets/liabilities 5,027 (7,674) 400  
Settlements 5,730 7,878 8,112  
Transfers, Net 0 0 0  
Gain (Loss) Included in Earnings 0 0 0  
Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0  
Purchases 0 0 0  
Issuances $ 0 $ 0 $ 0