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Income taxes - Summary of temporary difference (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 85,311 $ 98,218
Deferred tax liabilities 488,024 510,935
Recovery (9,441) (16,579)
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 458,622 498,384
Recovery (39,762) 14,823
Loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 33,587 42,079
Deferred tax liabilities 0 0
Recovery 8,492 (4,834)
Liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 35,794 31,793
Deferred tax liabilities 7,680 2,545
Recovery 1,697 (1,927)
Future withholding taxes    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 0 0
Deferred tax liabilities 6,234 0
Recovery 6,234 (20,000)
Other items    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 15,930 24,346
Deferred tax liabilities 15,488 10,006
Recovery $ 13,898 $ (4,641)