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Shares - Common stock issued and outstanding (Details) (CAD)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance, outstanding (shares) 36,251,006 36,249,086
Beginning balance, outstanding 304,908 304,896
Issued upon exercise of stock options (shares) 295,230 1,920
Issued upon exercise of stock options 1,175 7
Transferred from additional paid-in capital on exercise of stock options 567 5
Retired through Share Purchase Program (shares) (1,800,000)  
Retired through Share Purchase Program (16,133)  
Ending balance, outstanding (shares) 34,746,236 36,251,006
Ending balance, outstanding 290,517 304,908
Earnings Per Share [Abstract]    
Net loss from continuing operations (18,047) (32,496)
Net income from discontinued operations 87,231 18,823
Net income (loss) 69,184 (13,673)
Weighted average number of shares outstanding, basic    
Weighted average number of common shares (in shares) 36,269,996 36,250,959
Basic per share information    
Net loss from continuing operations (in CAD per share) (0.50) (0.90)
Net income from discontinued operations (in CAD per share) 2.41 0.52
Net income (loss) (in CAD per share) 1.91 (0.38)
Dilutive effect of stock options (in shares) 342,957 0
Weighted average number of shares outstanding, diluted    
Weighted average number of diluted common shares (in shares) 36,612,953 36,250,959
Diluted per share information    
Net loss from continuing operations (in CAD per share) (0.50) (0.90)
Net income from discontinued operations (in CAD per share) 2.39 0.52
Net income (loss) (in CAD per share) 1.89 (0.38)