Employee Benefit Plans - Change in fair value of plan assets (Details) - Foreign Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Change in fair value of plan assets
Fair value of plan assets, beginning balance	$ 15,415	$ 17,394
Employee contributions	406	437
Actual return on plan assets	461	(288)
Benefits (paid), net of transfers	(1,487)	(2,361)
Employer contributions	864	911
Foreign exchange adjustment	801	(678)
Fair value of plan assets, ending balance	$ 16,460	$ 15,415