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Accounting Changes - Narrative (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Jan. 01, 2018
Disclosure of changes in accounting estimates [line items]          
Contract liabilities (Note 5) $ 87,000 $ 62,000      
Deferred income tax liabilities (Note 11) 501,000 549,000      
Non-controlling interests (Note 12) 1,137,000 1,059,000      
Deficit (1,496,000) (1,209,000)      
Depreciation and amortization 574,000 635,000 $ 601,000    
Alberta Mine | Change in Useful Lives Estimate          
Disclosure of changes in accounting estimates [line items]          
Depreciation and amortization 38,000 58,000      
Sundance Unit 1 | Change in Useful Lives Estimate          
Disclosure of changes in accounting estimates [line items]          
Depreciation and amortization   26,000      
Sundance Unit 2 | Change in Useful Lives Estimate          
Disclosure of changes in accounting estimates [line items]          
Depreciation and amortization 4,000        
IFRS 15          
Disclosure of changes in accounting estimates [line items]          
IFRS 15 transition adjustment 17,000        
Contract liabilities (Note 5) 87,000 $ 62,000      
Deferred income tax liabilities (Note 11)         $ (4,000)
Deficit         13,000
Effect of transition to IFRSs [member]          
Disclosure of changes in accounting estimates [line items]          
Contract liabilities (Note 5) 19,000        
Deferred income tax liabilities (Note 11) (4,000)        
Non-controlling interests (Note 12)         $ 1,000
Deficit $ (15,000)        
Minimum | IFRS 16 [Member]          
Disclosure of changes in accounting estimates [line items]          
Right-of-use assets       $ 42,000  
Lease liabilities       42,000  
Maximum | IFRS 16 [Member]          
Disclosure of changes in accounting estimates [line items]          
Right-of-use assets       52,000  
Lease liabilities       $ 52,000