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Employee Benefit Plan - Change in Fair Value of Plan Assets (Details) - Non-U.S. Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Change in fair value of plan assets    
Fair value of plan assets $ 14,159 $ 12,823
Employee contributions 512 485
Actual return on plan assets 441 908
Benefits (paid), net of transfers (251) (977)
Employer contributions 1,088 977
Foreign exchange adjustment 1,341 (57)
Fair value of plan assets $ 17,290 $ 14,159