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Income and other taxes - Change in deferred income tax liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net    
Net, beginning of period $ (164,091) $ (153,639)
Deferred income tax recovery (expense) included in net income (62,464) (10,284)
Impact of U.S. tax rate change in other comprehensive income 0 (8,621)
Deferred income tax recovery included in other comprehensive income 3,980 9,295
Other 893 (842)
Net, end of period (221,682) (164,091)
Deferred tax assets    
Deferred tax assets, beginning of period 102,341 137,341
Deferred income tax recovery (expense) included in net income (44,277) (34,517)
Impact of U.S. tax rate change in other comprehensive income 0 (8,621)
Deferred income tax recovery included in other comprehensive income 1,253 8,398
Other 215 (260)
Deferred tax assets, end of period 59,532 102,341
Deferred tax liabilities    
Deferred tax liabilities, beginning of period (266,432) (290,980)
Deferred income tax recovery (expense) included in net income (18,187) 24,233
Impact of U.S. tax rate change in other comprehensive income 0 0
Deferred income tax recovery included in other comprehensive income 2,727 897
Other 678 (582)
Deferred tax liabilities, end of period $ (281,214) $ (266,432)