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Employee Benefit Plan - Net Unfunded Status (Details) - Non-U.S. Plan - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net unfunded status of pension plan      
Fair value of plan assets $ 12,823 $ 12,390 $ 11,024
Projected benefit obligation (18,173) (18,308) $ (16,690)
Net unfunded benefit obligation $ (5,350) $ (5,918)