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Long term debt - Credit Facility Narrative (Details)
12 Months Ended
Dec. 31, 2017
CAD
convenant
Dec. 31, 2016
CAD
Aug. 01, 2017
CAD
Jul. 31, 2017
CAD
Line of Credit Facility [Line Items]        
Payments of financing fees CAD 2,982,000 CAD 99,000    
Revolver        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity of credit facility     CAD 140,000,000.0  
Additional borrowing limit     25,000,000  
Capital lease borrowing limit     CAD 100,000,000.0  
Amount outstanding during period 800,000 800,000    
Prior borrowings       CAD 70,000,000
Unused borrowing availability under the revolving facility   58,200,000    
Payments of financing fees 840,000 30,000    
Write off of debt issuance costs CAD 329,000      
Term loan        
Line of Credit Facility [Line Items]        
Prior borrowings       CAD 30,000,000
Number of financial covenants | convenant 2      
Senior leverage ratio 3.0      
Minimum        
Line of Credit Facility [Line Items]        
Standby fees percentage 0.35%      
Minimum | Revolver        
Line of Credit Facility [Line Items]        
Prior borrowings CAD 107,200,000 51,700,000    
Maximum        
Line of Credit Facility [Line Items]        
Standby fees percentage 0.65%      
Maximum | Revolver        
Line of Credit Facility [Line Items]        
Prior borrowings   CAD 92,100,000    
Maximum | Term loan        
Line of Credit Facility [Line Items]        
Senior leverage ratio 3.5      
Fixed charge ratio 1.15