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Income and other taxes - Income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current tax recovery (expense):    
Current period before undernoted items $ (117,496) $ (95,402)
Benefit from unrecognised loss carry forwards 23,860 10,115
Adjustments to prior years 2,609 (217)
Current tax recovery (expense) (91,027) (85,504)
Deferred tax recovery (expense):    
Origination and reversal of temporary differences (56,258) 23,310
Adjustments to prior years (2,331) 200
Change in U.S. tax rate 0 (36,567)
Change in other jurisdictions tax rates 35 734
Other (3,910) 2,039
Deferred tax recovery (expense) (62,464) (10,284)
Tax expense (income), continuing operations $ (153,491) $ (95,788)