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Income taxes - Expiration of non-capital losses for income tax purposes (Details)
$ in Thousands
Dec. 31, 2019
CAD ($)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 185,614
2027  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 279
2032  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 5,099
2033  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 5,893
2034  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 3,531
2036  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 3,127
2037  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 18,955
2038  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 86,189
2039  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 62,541