Income Taxes (Summary of Valuation Allowance) (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of January 1	$ 298	$ 206	$ 2,002
Cost charged to the tax provision	70	100	45
Currency translation	(248)	(10)	(1,747)
Currency translation	(9)	2	(94)
Balance as of December 31	$ 111	$ 298	$ 206