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Employee benefit expense (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Classes Of Employee Benefits Expense [Abstract]    
Wages and salaries $ 238,000 $ 305,367
Statutory and company benefits 41,972 50,477
Expenses related to defined benefit plans 4,790 3,527
Expenses related to defined contribution plans 11,767 13,431
Equity-settled share-based compensation 17,469 18,821
Cash-settled share-based compensation (1,437) 3,597
Employee benefit expense $ 312,561 $ 395,220