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Assets Classified as Held for Sale - Impairment loss for an initial write-down of the assets held for sale (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets Classified as Held for Sale      
Property, plant and equipment $ 25,753 $ 28,871 $ 49,065
Interest in resource properties 196,634 201,802  
Asset held for sale 452,467 475,477  
Impairment loss on assets held for sale 1,246 (31,443)  
Carrying amount before impairment      
Assets Classified as Held for Sale      
Property, plant and equipment 48,191 49,140 72,446
Interest in resource properties   218,203 $ 264,795
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)    
Assets held for sale, net 49,552    
Sale proceeds, adjusted 18,109    
Impairment loss on assets held for sale (31,443) $ (31,443)  
Assets and liabilities classified as held for sale | Carrying amount before impairment      
Assets Classified as Held for Sale      
Property, plant and equipment 19,137    
Interest in resource properties 47,048    
Asset held for sale $ 66,185