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Assets Classified as Held for Sale (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Assets Classified as Held for Sale      
Property, plant and equipment $ 28,871 $ 49,065 $ 51,883
Interest in resource properties 201,802 254,706  
Asset held for sale 475,477 509,966  
Deferred income tax liabilities 56,570 67,461  
Liabilities relating to assets held for sale 142,970 $ 137,432  
Assets and liabilities classified as held for sale      
Assets Classified as Held for Sale      
Property, plant and equipment 1,358    
Interest in resource properties 33,385    
Asset held for sale 34,743    
Decommissioning obligations 16,633    
Deferred income tax liabilities 3,725    
Liabilities relating to assets held for sale $ 20,358