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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Income Taxes [Abstract]          
Effective income tax rate   37.00%   46.00%  
Provision to return adjustments $ 1,100   $ 2,700    
Valuation allowances against deferred tax assets 1,800   1,800   $ 2,200
Net deferred tax asset $ 1,200   $ 1,200    
Net deferred tax liability         $ 7