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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, 2018
Dec. 31, 2017
Change in fair value of plan assets    
Fair value of plan assets $ 12,390 $ 11,024
Employee contributions 506 530
Actual return on plan assets 904 91
Benefits (paid), net of transfers (1,601) (1,277)
Employer contributions 971 992
Foreign exchange adjustment (347) 1,030
Fair value of plan assets $ 12,823 $ 12,390