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Other non-current liabilities and employee future benefits - Future Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance $ 455  
Other    
Net defined benefit liability (asset), ending balance (475) $ 455
Defined benefit pension plan    
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance 348 1,814
Included in profit or loss    
Current service cost 26 30
Interest cost (income) 17 50
Benefits payable 0 0
Future plan expense 43 80
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 113 (4,547)
Experience adjustment (600) (91)
Return on plan assets excluding interest (486) 3,092
Plan expenses 0 0
Settlements 0 0
Remeasurement (gains) losses (973) (1,546)
Other    
Contributions paid by the employer 0 0
Benefits paid 0 0
Other total 0 0
Net defined benefit liability (asset), ending balance (582) 348
Defined benefit pension plan | Defined benefit obligation    
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance 14,402 19,187
Included in profit or loss    
Current service cost 26 30
Interest cost (income) 700 518
Benefits payable 0 0
Future plan expense 726 548
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 113 (4,547)
Experience adjustment (600) (91)
Return on plan assets excluding interest 0 0
Plan expenses (54) (24)
Settlements (7,326) 0
Remeasurement (gains) losses (7,867) (4,662)
Other    
Contributions paid by the employer 0 0
Benefits paid (558) (671)
Other total (558) (671)
Net defined benefit liability (asset), ending balance 6,703 14,402
Defined benefit pension plan | Fair value of plan assets    
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance (14,054) (17,373)
Included in profit or loss    
Current service cost 0 0
Interest cost (income) (683) (468)
Benefits payable 0 0
Future plan expense (683) (468)
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 0 0
Experience adjustment 0 0
Return on plan assets excluding interest (486) 3,092
Plan expenses 54 24
Settlements 7,326 0
Remeasurement (gains) losses 6,894 3,116
Other    
Contributions paid by the employer 0 0
Benefits paid 558 671
Other total 558 671
Net defined benefit liability (asset), ending balance (7,285) (14,054)
Net other post-retirement benefit plan liability    
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance 107 80
Included in profit or loss    
Interest cost (income) 5 2
Future plan expense 5 2
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 1 (23)
Experience adjustment 2 55
Remeasurement (gains) losses 3 32
Other    
Contributions paid by the employer (8) (7)
Benefits paid 0 0
Other total (8) (7)
Net defined benefit liability (asset), ending balance 107 107
Net other post-retirement benefit plan liability | Defined benefit obligation    
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance 107 80
Included in profit or loss    
Interest cost (income) 5 2
Future plan expense 5 2
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 1 (23)
Experience adjustment 2 55
Remeasurement (gains) losses 3 32
Other    
Contributions paid by the employer 0 0
Benefits paid (8) (7)
Other total (8) (7)
Net defined benefit liability (asset), ending balance 107 107
Net other post-retirement benefit plan liability | Fair value of plan assets    
Employee Benefits Future Plans [Roll Forward]    
Net defined benefit liability (asset), beginning balance 0 0
Included in profit or loss    
Interest cost (income) 0 0
Future plan expense 0 0
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 0 0
Experience adjustment 0 0
Remeasurement (gains) losses 0 0
Other    
Contributions paid by the employer (8) (7)
Benefits paid 8 7
Other total 0 0
Net defined benefit liability (asset), ending balance $ 0 $ 0