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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]    
Decreased deferred income tax expense $ 600  
Tax Year 2014 [Member]    
Operating Loss Carryforwards [Line Items]    
Net reduction in taxes due to the federal government   $ 17,600
Income tax refund receivable   $ 2,300
Deferred Income Taxes [Member]    
Operating Loss Carryforwards [Line Items]    
Decreased deferred income tax expense $ 24,200