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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, 2019
Dec. 31, 2018
Change in fair value of plan assets    
Fair value of plan assets $ 12,823 $ 12,390
Employee contributions 485 506
Actual return on plan assets 908 904
Benefits (paid), net of transfers (977) (1,601)
Employer contributions 977 971
Foreign exchange adjustment (57) (347)
Fair value of plan assets $ 14,159 $ 12,823