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Income taxes - Summary of Temporary Difference (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets $ 98,218 $ 84,043
Deferred tax liabilities 510,935 513,972
Expense (recovery) on the income statement (16,579) (118,839)
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 498,384 483,561
Expense (recovery) on the income statement 14,823 (108,501)
Loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 42,079 37,245
Deferred tax liabilities 0 0
Expense (recovery) on the income statement (4,834) (5,788)
Liabilities    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 31,793 27,321
Deferred tax liabilities 2,545 0
Expense (recovery) on the income statement (1,927) (2,631)
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 20,000
Expense (recovery) on the income statement (20,000) 20,000
Other items    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets 24,346 19,477
Deferred tax liabilities 10,006 10,411
Expense (recovery) on the income statement $ (4,641) $ (21,919)