Employee Benefit Plan - Net Unfunded Status (Details) - Non-U.S. Plan - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net unfunded status of pension plan
Fair value of plan assets	$ 14,159	$ 12,823	$ 12,390
Projected benefit obligation	(21,759)	(18,173)	$ (18,308)
Net unfunded benefit obligation	$ (7,600)	$ (5,350)