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Financial Instruments - Exposure to credit risk receivables (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 321,638 $ 392,865
Loss allowance 0  
Net 321,638  
Investment grade rating [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 244,315  
Non-investment grade rating [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 77,323