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Financial instruments - Maturity of derivative liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities $ 67,341 $ 217,642
Within one year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities 3,854 14,887
1-3 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities 24,250 45,467
3-5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities 21,500 63,025
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities $ 17,737 $ 94,263