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Debt - Summary of Debt (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 28, 2018
Disclosure Of Detailed Information About Borrowings [Line Items]        
Debt   $ 177,913 $ 54,636 $ 7,000
Current portion of long-term debt   177,913    
Syndicated Credit Agreement | Syndicated Facility        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest rate Prime + 2.5%      
Maturity Aug 27, 2021      
Principal $ 74,000      
Debt   82,910    
Syndicated Credit Agreement | Operating Facility        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest rate Prime + 2.5%      
Maturity Aug 27, 2021      
Principal $ 5,330      
Term Debt Facility        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Principal   115,000    
Debt   95,003    
Term Debt Facility | First Tranche        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Maturity Jul 27, 2023      
Principal $ 115,000      
Debt   $ 95,003    
Interest rate 9.75%