Income Taxes (Summary of Valuation Allowance) (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of January 1	$ 2,995	$ 2,242	$ 1,362
Cost charged to the tax provision	173	2,597	1,505
Currency translation	(10)	(1,750)	(820)
Currency translation	2	(94)	195
Balance as of December 31	$ 3,160	$ 2,995	$ 2,242