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Employee benefits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Current    
Profit sharing and bonuses $ 16,387 $ 20,085
Total 16,387 20,085
Non-current    
Profit sharing and bonuses 8,026 8,831
Severance indemnity payments 27,814 28,233
Total $ 35,840 $ 37,064