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Interest expense (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Schedule of Interest Expense [Line Items]    
Amortization of deferred financing costs CAD 572 CAD 1,961
Interest on long term debt 5,978 10,022
Other interest income (194) (142)
Total interest expense, net 5,784 9,880
Series 1 Debentures    
Schedule of Interest Expense [Line Items]    
Amortization of deferred financing costs 218 819
Capital lease obligations    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 2,836 3,044
Credit Facility    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 1,593 1,031
Debentures | Series 1 Debentures    
Schedule of Interest Expense [Line Items]    
Interest on long term debt CAD 977 CAD 3,986