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Mandatorily redeemable Series C preferred shares (Details) - CAD
CAD / shares in Units, CAD in Thousands
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Preferred stock redemption price per share (in CAD per share) CAD 25  
Disclosure Estimated Dividend And Redemption Payments [Abstract]    
2018 CAD 279,724  
2019 179,107  
2020 391,025  
2021 152,626  
2022 492,343  
Thereafter to 2031 2,331,327  
Preferred shares series C, noncurrent CAD 17,396 CAD 17,552
Series C Preferred Stock    
Class of Stock [Line Items]    
Redeemable preferred stock issued, shares 100  
Preferred stock redemption price per share (in CAD per share) CAD 53,400  
Disclosure Estimated Dividend And Redemption Payments [Abstract]    
Less amounts representing interest CAD (9,085)  
Total Preferred shares series C 18,464  
Less current portion (1,068)  
Preferred shares series C, noncurrent CAD 17,396  
Executives of company | Series C Preferred Stock    
Class of Stock [Line Items]    
Redeemable preferred stock issued, shares 36  
Dividends Payable | Series C Preferred Stock    
Disclosure Estimated Dividend And Redemption Payments [Abstract]    
2018 CAD 1,068  
2019 1,282  
2020 1,344  
2021 1,364  
2022 1,390  
Thereafter to 2031 15,761  
Redemption amount 5,340  
Estimated dividend and redemption payments CAD 27,549