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Provisions and other non-financial liabilities (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [abstract]    
Tax withholdings $ 3,345 $ 4,782
VAT payable 3,465 7,345
Guarantees received 2,641 2,641
Accrual for dividend 68,890 109,670
Monthly tax provisional payments 16,659 21,001
Deferred income 3,033 18,574
Withholdings from employees and salaries payable 4,575 6,052
Accrued vacations 21,686 20,070
Other current liabilities 2,605 4,489
Total $ 126,899 $ 194,624