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Summary Of Significant Accounting Policies (Other Income - Net) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Interest income $ 2,162 $ 1,823 $ 653
Interest on regulatory deferrals 1,288 1,308 48
Equity-related AFUDC 6,669 8,475 8,331
Net loss on investments (4,160) (2,152) (637)
Other income 1,104 624 905
Other income-net $ 7,063 $ 10,078 $ 9,300