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
Income Tax Disclosure [Abstract]
Tax (benefit) provisions	$ (246)	$ (208)	$ 952	$ 698
Pre-tax income	$ 4,725	$ 3,014	$ 8,841	$ 4,522
Effective income tax rate, Percent	(5.20%)	(6.90%)	10.80%	15.40%
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