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Long term debt (Details) - CAD
CAD in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Current portion of long term debt (note 13(a)) CAD 5,962 CAD 0
Long-term debt 42,537 64,269
Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 22,610 5,536
Corporate debentures    
Debt Instrument [Line Items]    
Long-term debt CAD 19,927 CAD 58,733