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Income and other taxes - Unused tax losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax effect $ (7,008) $ (7,013)
Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 1,377,598  
Tax effect 316,847  
Expire | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 962,296  
Tax effect 221,328  
Losses generated in 2015 (expires 2035) | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 294,774  
Tax effect 67,798  
Losses generated in 2016 (expires 2036) | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 432,581  
Tax effect 99,494  
Losses generated in 2017 (expires 2037) | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 234,941  
Tax effect 54,036  
Losses generated in 2019 | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 255,244  
Tax effect 58,706  
Losses generated in 2020 | Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross amount 160,058  
Tax effect $ 36,813