Employee Benefit Plans - Net periodic pension costs (Details) - Foreign Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost (gross)	$ 879	$ 1,107	$ 1,587
Interest cost	560	138	53
Expected return on plan assets	(358)	(288)	(302)
Amortization of unrecognized actuarial gain	(265)	(90)	(12)
Net periodic pension cost	$ 816	$ 867	$ 1,326