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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Decrease in accrued taxes $ 178 $ 816 $ (1,134)
Tax Year 2014 [Member]      
Operating Loss Carryforwards [Line Items]      
Net reduction in taxes due to the federal government 17,600    
Reserve against tangible property deductions 2,300    
Operating loss carry-forward 7,800    
Income tax refund receivable 10,300    
Increase in regulatory assets 1,500    
Decrease in accrued taxes 5,000    
Increase in accumulated deferred taxes $ 16,800