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Investments in associates and joint venture - Statement of fair values of the identifiable assets and liabilities of Tinka (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract]      
Consideration transferred $ 0 $ 13,453 $ 0