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Payroll and social securities payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Non-current    
Social security payable $ 1,240 $ 1,235
Non-current payroll and social security liabilities 1,240 1,235
Current    
Salaries payable 6,199 7,351
Social security payable 3,702 3,063
Provision for vacations 12,323 12,109
Provision for bonuses 5,043 4,321
Current payroll and social security liabilities 27,267 26,844
Total payroll and social security liabilities $ 28,507 $ 28,079