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Fair value of financial instruments - Disclosure of detailed information about fair value of long-term debt (Details) - CAD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of assets [line items]    
Borrowings not measured at fair value $ 293,281 $ 336,769
Level 1 [Member]    
Disclosure of fair value measurement of assets [line items]    
Borrowings not measured at fair value 293,281 286,903
Level 2 [Member]    
Disclosure of fair value measurement of assets [line items]    
Borrowings not measured at fair value 0 49,866
Fair value [Member]    
Disclosure of fair value measurement of assets [line items]    
Borrowings not measured at fair value 303,000 367,928
Fair value [Member] | Level 1 [Member]    
Disclosure of fair value measurement of assets [line items]    
Borrowings not measured at fair value 303,000 318,000
Fair value [Member] | Level 2 [Member]    
Disclosure of fair value measurement of assets [line items]    
Borrowings not measured at fair value $ 0 $ 49,928