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Related-party transactions - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Directors and senior management      
Disclosure of transactions between related parties [line items]      
Compensation selected employees $ (5,232) $ (7,122) $ (7,040)
Payables (Note 26) (15,499) (16,353)  
Joint venture      
Disclosure of transactions between related parties [line items]      
Receivables from related parties 0 8,337  
Payables (Note 26) 0 (194)  
Sales of goods 0 456 2,487
Services 0 210 88
Interest income 0 $ 242 $ 308
Related party loan $ 8,000    
Interest rate on borrowings (as a percent) 3.00%