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Employee benefits - Classes of Benefits and Expenses by Employee (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Current    
Profit sharing and bonuses $ 2,270 $ 1,383
Performance bonus and operational 33,106 25,392
Total 35,376 26,775
Non-current    
Profit sharing and bonuses 8,973 0
Severance indemnity payments 34,899 27,099
Total $ 43,872 $ 27,099