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Pension and other post-retirement benefits - components of net pension and other benefit expense (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of benefit plans [line items]    
Defined benefit expense $ 3,527 $ 5,208
Defined contribution pension expense 13,431 15,929
Employee benefit expense 395,220 431,559
Pension plans [member]    
Disclosure of benefit plans [line items]    
Current service cost 1,670 1,544
Interest income or cost 1,409 1,490
Administration cost 2 2
Defined benefit expense 3,081 3,036
Defined contribution pension expense 13,431 15,929
Employee benefit expense 16,512 18,965
Amount of actuarial losses (gains) recognized in other comprehensive income    
Actuarial loss (gain) (3,720) 6,243
Return on assets excluding interest income 292 2
Total actuarial losses (gains) recognized in other comprehensive income (3,428) 6,245
Other Benefit Plans [Member]    
Disclosure of benefit plans [line items]    
Current service cost 1,429 1,227
Interest income or cost 946 945
Past service cost (1,929) 0
Administration cost 0 0
Defined benefit expense 446 2,172
Defined contribution pension expense 0 0
Employee benefit expense 446 2,172
Amount of actuarial losses (gains) recognized in other comprehensive income    
Actuarial loss (gain) (4,998) 2,126
Return on assets excluding interest income 0 0
Total actuarial losses (gains) recognized in other comprehensive income $ (4,998) $ 2,126