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Retirement plans - Defined benefit pension plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Balance, beginning of year $ 15,239  
Past service cost (2,479) $ 0
Balance, end of year 16,973 15,239
Unfunded status 16,973 15,239
Minimum funding requirement 0 0
Accrued benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Balance, beginning of year 53,586 62,208
Current service cost 2,246 2,329
Past service cost 2,479 0
Interest cost on accrued benefit obligations / income on assets 2,549 2,007
Benefit payments (4,280) (5,760)
Settlements (3,738) 0
Actuarial (gain) loss 2,074 (4,047)
Foreign exchange gain (loss) 265 (3,151)
Balance, end of year 55,181 53,586
Fair values of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Balance, beginning of year 38,347 46,608
Interest cost on accrued benefit obligations / income on assets 1,901 1,221
Benefit payments (4,280) (5,760)
Settlements (3,680) 0
Contributions 5,687 4,457
Return on plan assets (705) (5,173)
Foreign exchange gain (loss) 938 (3,006)
Balance, end of year $ 38,208 $ 38,347