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Investment property - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period $ 31,179 $ 34,295
Net gain / (loss) from fair value adjustment (Note 8) (4,331) 1,077
Reclassification to property, plant and equipment (1,380) (3,127)
Exchange difference 6,664 (1,066)
Investment property, end of period 32,132 31,179
Cost    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 31,179  
Investment property, end of period 32,132 31,179
Fair value    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 31,179  
Investment property, end of period $ 32,132 $ 31,179