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Capital Management - Net Debt (Details) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Trade and other payables $ 190,692 $ 155,955
Trade and other receivables (173,409) (107,477)
Net Debt 1,409,717 1,847,601
Unamortized debt issuance costs | Credit facilities    
Disclosure of detailed information about borrowings [line items]    
Borrowings 1,343 1,952
Unamortized debt issuance costs | Long-term notes    
Disclosure of detailed information about borrowings [line items]    
Borrowings 11,393 15,082
Cost | Credit facilities    
Disclosure of detailed information about borrowings [line items]    
Borrowings (505,171) (649,221)
Cost | Long-term notes    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ (874,527) $ (1,132,868)