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Interest expense (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Interest Expense [Line Items]      
Amortization of deferred financing costs CAD 1,961 CAD 1,594 CAD 4,326
Interest on long term debt 10,022 12,133 21,973
Other interest (income) expense (142) 102 (276)
Total interest expense, net 9,880 12,235 21,697
Capital lease obligations      
Schedule of Interest Expense [Line Items]      
Interest on long term debt 3,044 3,103 2,716
Credit Facility      
Schedule of Interest Expense [Line Items]      
Interest on long term debt 1,031 1,268 2,424
Corporate debentures | Series 1 Debentures      
Schedule of Interest Expense [Line Items]      
Interest on long term debt CAD 3,986 CAD 6,168 CAD 12,507