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Income taxes - Summary of temporary difference (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]    
Deferred tax assets $ 60,060 $ 85,311
Deferred tax liabilities 499,255 499,865
Expense (Recovery) 49,796 (6,214)
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 0 0
Deferred tax liabilities 490,868 470,500
Expense (Recovery) 37,727 (32,891)
Loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 19,166 33,587
Deferred tax liabilities 0 0
Expense (Recovery) 22,206 7,325
Liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 34,012 35,794
Deferred tax liabilities 0 10,070
Expense (Recovery) (5,909) 1,647
Future withholding taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 0 0
Deferred tax liabilities 0 6,234
Expense (Recovery) (6,234) 6,234
Other items    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 6,882 15,930
Deferred tax liabilities 8,387 13,061
Expense (Recovery) $ 2,006 $ 11,471