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Income taxes - Expiration of non-capital losses for income tax purposes (Details)
CAD in Thousands
Dec. 31, 2017
CAD
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards CAD 65,126
2025  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 2
2026  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 151
2027  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 128
2028  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 0
2029  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 0
2030  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 0
2031  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 604
2032  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 9,354
2033  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 13,829
2034  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 8,317
2035  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 0
2036  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 5,691
2037  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards CAD 27,050