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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
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Disclosure of other provisions [abstract] |  |  |
Noncurrent provisions | $ 4,078 | $ 3,299 |
Current provisions | 765 | 590 |
Total provisions | $ 4,843 | $ 3,889 | $ 2,313

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