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Segmented Financial Information - Assets By Segment (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Assets $ 3,408,096 $ 5,914,083
Operating segments | Canada    
Disclosure of operating segments [line items]    
Assets 1,646,412 3,484,123
Operating segments | U.S.    
Disclosure of operating segments [line items]    
Assets 1,737,533 2,403,310
Operating segments | Corporate    
Disclosure of operating segments [line items]    
Assets $ 24,151 $ 26,650