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Long term debt - Credit Facility Narrative (Details)
 12 Months Ended
Dec. 31, 2020
CAD ($)
convenant
Dec. 31, 2019
CAD ($)
Oct. 08, 2020
CAD ($)
Nov. 23, 2018
CAD ($)
Line of Credit Facility [Line Items]        
Financing costs $ 965,000 $ 2,689,000    
Credit facility | Revolver | Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility     $ 325,000,000.0 $ 300,000,000.0
Additional borrowing limit     25,000,000.0 50,000,000.0
Finance lease borrowing limit     150,000,000.0 150,000,000.0
Other outstanding debt limit     $ 20,000,000.0 20,000,000.0
Financing costs 965,000      
Amount outstanding during period 900,000 900,000    
Unused borrowing availability under the revolving facility 104,100,000 109,100,000    
Unused borrowing availability under finance lease obligations $ 29,400,000 $ 53,900,000    
Number of financial covenants | convenant 2      
Senior leverage ratio, step-up 0.50      
Fixed charge ratio 1.15      
Credit facility | Revolver | Minimum | Credit Facility        
Line of Credit Facility [Line Items]        
Standby fees percentage 0.40%      
Credit facility | Revolver | Maximum | Credit Facility        
Line of Credit Facility [Line Items]        
Standby fees percentage 0.75%      
Credit facility | Letter of credit | Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility       $ 25,000,000.0
Debt covenant period, tranche two | Credit facility | Revolver | Credit Facility        
Line of Credit Facility [Line Items]        
Senior leverage ratio 3.0