Income Taxes Tax Reform (Textual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
Net tax benefit related to estimate of the provisions of the 2017 Tax Act	$ 54
Income (Loss) from Continuing Operations before Income Taxes, Foreign	7,818
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	2,958	$ 754
Valuation Allowance, Deferred Tax Asset, Explanation of Change	4,447
2017 Tax Cuts and Jobs Act [Member]
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Explanation of Change	1,780
Transition Toll Tax [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	1,935
Valuation Allowance, Deferred Tax Asset, Explanation of Change	802
Federal statutory rate reduction from 35% to 21% [Member]
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Explanation of Change	$ 926