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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Tax provisions (benefit) $ 525 $ 431  
Pretax losses $ 1,497 $ 1,991  
Effective income tax rate, Percent (35.10%) (21.60%)  
Tax benefit adjustments related to tax cuts and jobs act     $ 1,508
Additional tax expense from foreign tax positions, related to tax and jobs act     $ 3,298