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Employee benefit plans - Summary of movement in the fair value of plan assets of the year (Details) - Plan assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value of plan assets [line items]    
Beginning Balance $ 8,470 $ 26,568
Interest income on plan assets   778
Actuarial gain (loss)   (1,324)
Contributions by employer   1,281
Assets distributed on settlement   (18,086)
Benefit payments   (318)
Exchange loss   (429)
Ending Balance   8,470
SERP    
Disclosure of fair value of plan assets [line items]    
Beginning Balance 8,470 24,610
Interest income on plan assets 0 736
Actuarial gain (loss) 0 (1,383)
Contributions by employer 0 0
Assets distributed on settlement (8,470) (14,945)
Benefit payments 0 (180)
Exchange loss 0 (368)
Ending Balance 0 8,470
Employee benefit plans    
Disclosure of fair value of plan assets [line items]    
Beginning Balance $ 0 1,958
Interest income on plan assets   42
Actuarial gain (loss)   59
Contributions by employer   1,281
Assets distributed on settlement   (3,141)
Benefit payments   (138)
Exchange loss   (61)
Ending Balance   $ 0