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Shares - Share Purchase Program (Details) - CAD
CAD in Thousands
1 Months Ended 12 Months Ended
Aug. 14, 2015
Dec. 18, 2014
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]            
Retired through share purchase programs (shares)       1,803,715 500,000 1,800,000
Stock Purchase Program            
Equity, Class of Treasury Stock [Line Items]            
Shares retired during period (shares)         500,000  
Common stock | NCIB stock purchase program            
Equity, Class of Treasury Stock [Line Items]            
Retired through share purchase programs (shares) 532,520          
Shares retired during period (shares)       532,520    
Increase (decrease) as a result of the retirement of shares       CAD 4,500    
Common stock | Stock Purchase Program            
Equity, Class of Treasury Stock [Line Items]            
Retired through share purchase programs (shares)   1,771,195        
Shares retired during period (shares)     1,271,195 1,771,195    
Increase (decrease) as a result of the retirement of shares     CAD (10,917)   CAD (4,238)  
Percentage of issued and outstanding common shares purchased under Purchase Program   5.00%        
Additional paid in capital | NCIB stock purchase program            
Equity, Class of Treasury Stock [Line Items]            
Increase (decrease) as a result of the retirement of shares       CAD 2,948    
Additional paid in capital | Stock Purchase Program            
Equity, Class of Treasury Stock [Line Items]            
Increase (decrease) as a result of the retirement of shares     CAD 6,284   CAD 2,297