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Financial instruments and risk management - Financial instruments (Details) - CAD
CAD in Thousands
Dec. 31, 2015
Dec. 31, 2014
Credit facilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Outstanding balance, long-term debt CAD 28,600 CAD 5,500
Fair Value, Inputs, Level 2 | Carrying Amount    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Capital lease obligations [1] 62,443 64,055
Fair Value, Inputs, Level 2 | Fair Value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Capital lease obligations [1] 57,976 58,951
Fair Value, Inputs, Level 1 | Carrying Amount    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Series 1 Debentures [2] 19,927 58,733
Fair Value, Inputs, Level 1 | Fair Value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Series 1 Debentures [2] CAD 19,927 CAD 58,733
[1] The fair values of amounts due under capital leases are based on management estimates which are determined by discounting cash flows required under the instruments at the interest rates currently estimated to be available for instruments with similar terms.
[2] The fair value of the Series 1 Debentures is based upon the