Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax provisions (benefit)	$ 673	$ 475	$ 1,198	$ 906
Pretax losses	$ (5,613)	$ (3,499)	$ (4,116)	$ (1,508)
Effective income tax rate, Percent	12.00%	13.60%	29.10%	60.10%
Tax benefit adjustments related to tax cuts and jobs act			$ (1,508)		$ 1,508
Additional tax expense from foreign tax positions, related to tax and jobs act					$ 3,298