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Restructuring (Schedule of Restructuring Liability) (Details) - Employee Severance - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Restructuring Reserve [Roll Forward]    
Beginning balance $ 2,195 $ 2,042
Restructuring charges accrued 43 3,479
Payments (1,485) (1,410)
Currency translation /other 11 (5)
Ending balance $ 764 $ 4,106