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Provisions for other liabilities - Total Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [abstract]      
Non current $ 2,705 $ 2,936 [1]  
Current 1,654 236 [1]  
Total provisions $ 4,359 $ 3,172 $ 3,625
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.