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Other income (expense) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other Income Expense [Abstract]    
Foreign exchange gains (losses) $ (23,168) $ (5,935)
Contract settlements 0 59,027
Gain on change in investment accounting 0 7,032
Write off of long-term receivables (5,926) 0
Other (1,316) 547
Total other income (expense) $ (30,410) $ 60,671