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Investment property - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [line items]      
Investment property $ 31,179 $ 34,295 [1] $ 40,725
Fair value      
Disclosure of detailed information about investment property [line items]      
Investment property 31,179 34,295  
Level 3 | Fair value      
Disclosure of detailed information about investment property [line items]      
Investment property 31,200 34,200  
Decrease in investment property $ 3,100 $ 3,400  
[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.