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Provisions for other liabilities - Summary of Total Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [abstract]      
Noncurrent provisions $ 3,296 $ 4,078 [1] $ 3,299 [1]
Current provisions 329 765 [1] 590 [1]
Total provisions $ 3,625 $ 4,843 $ 3,889
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.