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Investment property - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period $ 34,295 [1] $ 40,725
Net gain / (loss) from fair value adjustment (Note 8) 1,077 (325)
Reclassification to property, plant and equipment (3,127) (4,816)
Exchange difference (1,066) (1,289)
Investment property, end of period 31,179 34,295 [1]
Cost    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 34,295  
Investment property, end of period 31,179 34,295
Fair value    
Disclosure of detailed information about investment property [line items]    
Investment property, beginning of period 34,295  
Investment property, end of period $ 31,179 $ 34,295
[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.