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Shares - Voting common shares (Details)
CAD / shares in Units, CAD in Thousands
 12 Months Ended
Dec. 31, 2015
CAD
CAD / shares
shares
Dec. 31, 2014
CAD
CAD / shares
shares
Dec. 31, 2013
CAD
CAD / shares
shares
Dec. 31, 2013
$ / shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance, issued and outstanding (shares) 34,923,916 34,746,236 36,251,006  
Beginning balance, common share outstanding net of treasury shares (in shares) 34,334,024 34,746,236 36,251,006  
Issued upon exercise of stock options (shares)   385,880 295,230  
Settlement of certain equity classified stock-based compensation (shares) 20,403      
Retired through share purchase programs (shares) (1,803,715) (500,000) (1,800,000)  
Ending balance, issued and outstanding (in shares) 33,150,281 34,923,916 34,746,236  
Ending balance, common share outstanding net of treasury shares (in shares) 31,893,478 34,334,024 34,746,236  
Earnings Per Share [Abstract]        
Net loss from continuing operations | CAD CAD (7,470) CAD (697) CAD (18,047)  
Net loss (income) from discontinued operations | CAD 0 (472) 87,231  
Net (loss) income | CAD CAD (7,470) CAD (1,169) CAD 69,184  
Weighted average number of shares outstanding, basic        
Weighted average number of basic common shares (in shares) 32,758,088 35,014,418 36,269,996  
Dilutive effect of stock options and treasury shares (in shares) 0 0 342,957  
Weighted average number of diluted common shares (in shares) 32,758,088 35,014,418 36,612,953  
Basic per share information        
Net loss from continuing operations (in CAD per share) | CAD / shares CAD (0.23) CAD (0.02) CAD (0.50)  
Net loss (income) from discontinued operations (in CAD per share) | CAD / shares 0.00 (0.01) 2.41  
Net (loss) income - diluted (in CAD per share) | CAD / shares (0.23) (0.03) 1.91  
Diluted per share information        
Net loss from continuing operations (in CAD per share) | (per share) (0.23) (0.02)   $ (0.50)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | (per share) 0.00 (0.01) 2.39 2.39
Net (loss) income (in CAD per share) | (per share) CAD (0.23) CAD (0.03) CAD 1.89 $ 1.89
Share option plan        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issued upon exercise of stock options (shares) [1] 30,080 385,880 295,230  
Senior executive stock option plan        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issued upon exercise of stock options (shares)   291,800    
Treasury shares        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance, issued and outstanding (shares) 589,892      
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (687,314) (589,892)    
Settlement of certain equity classified stock-based compensation (shares) 20,403      
Ending balance, issued and outstanding (in shares) 1,256,803 589,892    
[1] All stock options exercised resulted in new common shares being issued (note 17(a))