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Employee benefits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current    
Profit sharing and bonuses $ 7,770 $ 0
Performance bonds and operational targets 1,326 16,387
Total 9,096 16,387
Non-current    
Profit sharing and bonuses 0 8,026
Severance indemnity payments 32,199 27,814
Total $ 32,199 $ 35,840