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Income and other taxes - Change in deferred income tax liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net    
Net, beginning of period $ (161,206) $ (217,153)
Deferred income tax recovery included in net income 87,301 34,335
Deferred income tax recovery (expense) included in other comprehensive income (2,325) 22,049
Other 362 (437)
Net, end of period (75,868) (161,206)
Deferred tax assets    
Deferred tax assets, beginning of period 111,614 60,065
Deferred income tax recovery included in net income 28,243 28,875
Deferred income tax recovery (expense) included in other comprehensive income (2,333) 21,871
Other 0 803
Deferred tax assets, end of period 137,524 111,614
Deferred tax liabilities    
Deferred tax liabilities, beginning of period (272,820) (277,218)
Deferred income tax recovery included in net income 59,058 5,460
Deferred income tax recovery (expense) included in other comprehensive income 8 178
Other 362 (1,240)
Deferred tax liabilities, end of period (213,392) (272,820)
Previously stated    
Net    
Net, beginning of period (161,206) (221,682)
Net, end of period   (161,206)
Deferred tax assets    
Deferred tax assets, beginning of period 111,614 59,532
Deferred tax assets, end of period   111,614
Deferred tax liabilities    
Deferred tax liabilities, beginning of period (272,820) (281,214)
Deferred tax liabilities, end of period   (272,820)
Adjustment on adoption of IFRS 16    
Net    
Net, beginning of period 0 4,529
Net, end of period   0
Deferred tax assets    
Deferred tax assets, beginning of period 0 533
Deferred tax assets, end of period   0
Deferred tax liabilities    
Deferred tax liabilities, beginning of period $ 0 3,996
Deferred tax liabilities, end of period   $ 0