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Provisions for other liabilities - Total Provisions (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of other provisions [abstract] |  |  |
Noncurrent provisions | $ 2,936 | $ 3,296 |
Current provisions | 236 | 329 |
Total provisions | $ 3,172 | $ 3,625 | $ 4,843

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