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Employee future benefits - Future Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance $ 3,941  
Other    
Net defined benefit liability (asset), ending balance 1,894 $ 3,941
Defined benefit pension plan    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 3,856 4,308
Included in profit or loss    
Current service cost 37 36
Interest cost (income) 93 126
Benefits payable 0 0
Future plan expense 130 162
Actuarial loss (gain) arising from:    
Demographic assumptions 56 (150)
Financial assumptions (986) 2,054
Experience adjustment 92 110
Return on plan assets excluding interest (1,334) (1,733)
Plan expenses 0 0
Remeasurement (gains) losses (2,172) 281
Other    
Contributions paid by the employer 0 (895)
Benefits paid 0 0
Other total 0 (895)
Net defined benefit liability (asset), ending balance 1,814 3,856
Defined benefit pension plan | Defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 20,203 18,272
Included in profit or loss    
Current service cost 37 36
Interest cost (income) 476 566
Benefits payable 0 0
Future plan expense 513 602
Actuarial loss (gain) arising from:    
Demographic assumptions 56 (150)
Financial assumptions (986) 2,054
Experience adjustment 92 110
Return on plan assets excluding interest 0 0
Plan expenses (30) (36)
Remeasurement (gains) losses (868) 1,978
Other    
Contributions paid by the employer 0 0
Benefits paid (661) (649)
Other total (661) (649)
Net defined benefit liability (asset), ending balance 19,187 20,203
Defined benefit pension plan | Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance (16,347) (13,964)
Included in profit or loss    
Current service cost 0 0
Interest cost (income) (383) (440)
Benefits payable 0 0
Future plan expense (383) (440)
Actuarial loss (gain) arising from:    
Demographic assumptions 0 0
Financial assumptions 0 0
Experience adjustment 0 0
Return on plan assets excluding interest (1,334) (1,733)
Plan expenses 30 36
Remeasurement (gains) losses (1,304) (1,697)
Other    
Contributions paid by the employer 0 (895)
Benefits paid 661 649
Other total 661 (246)
Net defined benefit liability (asset), ending balance (17,373) (16,347)
Other post-retirement benefit plan    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 85 88
Included in profit or loss    
Interest cost (income) 1 2
Future plan expense 1 2
Actuarial loss (gain) arising from:    
Demographic assumptions 0 (5)
Financial assumptions (2) 6
Experience adjustment 4 7
Remeasurement (gains) losses 2 8
Other    
Contributions paid by the employer (8) (13)
Benefits paid 0 0
Other total (8) (13)
Net defined benefit liability (asset), ending balance 80 85
Other post-retirement benefit plan | Defined benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 85 88
Included in profit or loss    
Interest cost (income) 1 2
Future plan expense 1 2
Actuarial loss (gain) arising from:    
Demographic assumptions 0 (5)
Financial assumptions (2) 6
Experience adjustment 4 7
Remeasurement (gains) losses 2 8
Other    
Contributions paid by the employer 0 0
Benefits paid (8) (13)
Other total (8) (13)
Net defined benefit liability (asset), ending balance 80 85
Other post-retirement benefit plan | Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
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) (13)
Benefits paid 8 13
Other total 0 0
Net defined benefit liability (asset), ending balance $ 0 $ 0