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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jun. 30, 2018
Income Taxes [Abstract]            
U.S. corporate income tax rate     21.00%   35.00%  
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred tax asset, income tax expense         $ 3,570  
Income tax provision (benefit) $ 596 $ 10 $ (661) $ 261    
Tax Cuts and Jobs Act of 2017, Expected income tax benefit change     $ 669      
Effective Income Tax Rate, Percent     10.60% (10.90%)    
Changes in valuation allowance     $ (60)      
Tax, refund received $ 4,095   $ 4,095     $ 3,210