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Shares - Voting common shares (Details) - CAD
CAD / shares in Units, CAD in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, issued and outstanding (in shares) 33,150,281 34,923,916
Beginning balance, common share outstanding net of treasury shares (in shares) 31,893,478 34,334,024
Issued upon exercise of stock options (in shares)   30,080
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) 87,554 20,403
Retired through share purchase programs (in shares) (2,733,414) (1,803,715)
Ending balance, issued and outstanding (in shares) 30,518,907 33,150,281
Ending balance, common share outstanding net of treasury shares (in shares) 28,305,660 31,893,478
Earnings Per Share [Abstract]    
Net loss CAD (445) CAD (7,470)
Weighted average number of common shares (no dilutive effect) (in shares) 29,965,899 32,758,088
Basic per share information (No dilutive effect)    
Net loss (in CAD per share) CAD (0.01) CAD (0.23)
Share option plan    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Issued upon exercise of stock options (in shares) [1] 102,040 30,080
Treasury shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, issued and outstanding (in shares) 1,256,803 589,892
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) (1,043,998) (687,314)
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (in shares) 87,554 20,403
Ending balance, issued and outstanding (in shares) 2,213,247 1,256,803
Equity classified stock-based compensation settled (in shares) 35,313  
[1] All stock options exercised resulted in new common shares being issued (note 17(a))