Income Taxes (Summary of Valuation Allowance) (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of January 1	$ 766	$ 400	$ 306
Cost charged to the tax provision	983	286	144
Currency translation	(338)	(78)	(50)
Purchase accounting adjustment and divestiture	0	158	0
Currency translation	(49)	0	0
Balance as of December 31	$ 1,362	$ 766	$ 400