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Long term debt - Credit facilities (Details)
CAD in Thousands
12 Months Ended
Jul. 08, 2015
CAD
Dec. 31, 2014
CAD
Jun. 30, 2016
CAD
Dec. 31, 2015
CAD
Line of Credit Facility [Line Items]        
Long-term line of credit   CAD 5,536   CAD 28,572
Line of credit, current   0   (5,962)
Long-term line of credit, non-current   5,536   22,610
Maximum borrowing capacity of credit facility CAD 100,000      
Fixed charge ratio 1.0      
Borrowing base       83,800
Secured Debt        
Line of Credit Facility [Line Items]        
Long-term line of credit   0   28,572
Maximum borrowing capacity of credit facility CAD 30,000      
Amortization schedule for repayment 84 months      
Repayment percentage of excess cash flow 25.00%      
Required scheduled payment CAD 1,700      
Revolving Facility        
Line of Credit Facility [Line Items]        
Long-term line of credit   5,536   0
Maximum borrowing capacity of credit facility CAD 70,000      
Amount outstanding during period       2,400
Unused borrowing availability under the revolving facility       CAD 52,800
Tranche A | Revolving Facility        
Line of Credit Facility [Line Items]        
Drawdown against revolver   5,500    
Tranche B | Letter of Credit        
Line of Credit Facility [Line Items]        
Unused borrowing availability under the revolving facility   CAD 5,100    
Maximum        
Line of Credit Facility [Line Items]        
Senior leverage ratio 3.5      
Minimum        
Line of Credit Facility [Line Items]        
Senior leverage ratio 3.0      
Corporate debentures | Maximum | Series 1 Debentures        
Line of Credit Facility [Line Items]        
Debenture repurchase amount authorized CAD 40,000      
Scenario, Forecast | Corporate debentures | Series 1 Debentures        
Line of Credit Facility [Line Items]        
Debenture outstanding face amount of debt     CAD 20,000