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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
Income Tax Reconcilation, Deferred Tax Revaluation Adjustment $ 629 $ 0 $ 0
Unrecognized tax benefits at end of year 0 0  
Unrecognized tax benefits that are expected to significantly increase or decrease within the next twelve months 0    
State and local jurisdiction      
Operating Loss Carryforwards [Line Items]      
State net operating loss carryforwards 9,900 $ 10,700  
Other tax carryforward, valuation allowance $ 0