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Payroll and social securities payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Non-current      
Social security payable $ 1,219 $ 1,240  
Non-current payroll and social security liabilities 1,219 1,240 [1] $ 1,235
Current      
Salaries payable 8,841 6,199  
Social security payable 3,112 3,702  
Provision for vacations 9,770 12,323  
Provision for bonuses 4,255 5,043  
Current payroll and social security liabilities 25,978 27,267  
Total payroll and social security liabilities $ 27,197 $ 28,507  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.