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Employee benefit expense (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Classes Of Employee Benefits Expense [Abstract]    
Wages and salaries $ 305,367 $ 331,521
Statutory and company benefits 50,477 60,334
Expenses related to defined benefit plans 3,527 5,208
Expenses related to defined contribution plans 13,431 15,929
Equity-settled share-based compensation 18,821 18,433
Cash-settled share-based compensation 3,597 134
Employee benefit expense $ 395,220 $ 431,559