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Provisions for other liabilities - Summary of Total Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of other provisions [abstract]      
Noncurrent provisions $ 4,078 $ 3,299  
Current provisions 765 590  
Total provisions $ 4,843 $ 3,889 $ 2,313