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Salaries and other employee expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of employee benefits [Abstract]      
Wages and salaries $ 16,191 $ 16,132 $ 15,500
Payroll Taxes 2,629 2,244 2,264
Personnel benefits 5,442 3,090 8,613
Share-based payments 3,391 3,730 4,058
Total $ 27,653 $ 25,196 $ 30,435