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Employee Benefit Plan - Net Unfunded Status (Details) - Non-U.S. Plan - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net unfunded status of pension plan      
Fair value of plan assets $ 17,290 $ 14,159 $ 12,823
Projected benefit obligation (27,431) (21,759) $ (18,173)
Net unfunded benefit obligation $ (10,141) $ (7,600)