Restructuring (Summary of Restructuring Accrual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 188	$ 0
Charges	506	1,780
Cash payments	(688)	(1,592)
Foreign exchange adjustment	(6)
Restructuring reserve, ending balance	0	188
Severance and Employee Benefit Costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	149	0
Charges	417	1,466
Cash payments	(560)	(1,317)
Foreign exchange adjustment	(6)
Restructuring reserve, ending balance	0	149
Contract Cancellations
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	39	0
Charges	89	314
Cash payments	(128)	(275)
Foreign exchange adjustment	0
Restructuring reserve, ending balance	$ 0	$ 39