Employee Benefits - Information Related to Changes in Projected Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 52,503	$ 44,890	$ 45,450
Service cost	4,421	3,659	3,145
Interest cost	718	851	840
Actuarial loss (gain) due to assumption changes and plan experience (1)	1,516	4,524	(430)
Contractual termination benefits	0	0	(950)
Benefits payments	(1,438)	(830)	(1,400)
Foreign currency impact	4,577	(591)	(1,765)
Projected benefit obligation at end of year	$ 62,297	$ 52,503	$ 44,890
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Weighted average discount rate	0.94%	1.28%	1.81%
Average compensation increase	2.58%	2.58%	2.58%
Cash balance interest credit rate	0.80%	1.20%	1.90%
Expected future benefit payments, in 2021	$ 1,800
Expected future benefit payments, in 2022	1,800
Expected future benefit payments, in 2023	2,300
Expected future benefit payments, in 2024	2,300
Expected future benefit payments, in 2025	2,500
Expected future benefit payments in the five years thereafter	$ 15,100