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Finance cost (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Borrowing costs [abstract]    
Interest on long-term debt $ 63,136 $ 73,039
Unwinding of discount on provisions 20,789 23,681
Other charges 14,697 15,059
Finance costs 98,622 $ 111,779
Borrowing costs capitalised $ 0