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Income and other taxes - Change in deferred income tax liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Net    
Net, beginning of period $ (221,682) $ (164,091)
Deferred income tax recovery (expense) included in net income 34,335 (62,464)
Deferred income tax recovery included in other comprehensive income 22,049 3,980
Other (437) 893
Net, end of period (161,206) (221,682)
Deferred tax assets    
Deferred tax assets, beginning of period 59,532 102,341
Deferred income tax recovery (expense) included in net income 28,875 (44,277)
Deferred income tax recovery included in other comprehensive income 21,871 1,253
Other 803 215
Deferred tax assets, end of period 111,614 59,532
Deferred tax liabilities    
Deferred tax liabilities, beginning of period (281,214) (266,432)
Deferred income tax recovery (expense) included in net income 5,460 (18,187)
Deferred income tax recovery included in other comprehensive income 178 2,727
Other (1,240) 678
Deferred tax liabilities, end of period (272,820) (281,214)
Previously stated    
Net    
Net, beginning of period (221,682)  
Net, end of period   (221,682)
Deferred tax assets    
Deferred tax assets, beginning of period 59,532  
Deferred tax assets, end of period   59,532
Deferred tax liabilities    
Deferred tax liabilities, beginning of period $ (281,214)  
Deferred tax liabilities, end of period   $ (281,214)