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Financial instruments and risk management - Financial instruments (Details) - CAD
CAD in Thousands
Dec. 31, 2016
Dec. 31, 2015
Credit facilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Outstanding balance, long-term debt CAD 39,600 CAD 28,600
Fair Value, Inputs, Level 2 | Carrying Amount    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Capital lease obligations [1] 61,400 62,443
Fair Value, Inputs, Level 2 | Fair Value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Capital lease obligations [1] 57,741 57,976
Fair Value, Inputs, Level 1 | Carrying Amount    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Series 1 Debentures [2] 0 19,927
Fair Value, Inputs, Level 1 | Fair Value    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Series 1 Debentures [2] CAD 0 CAD 19,927
[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