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Share Capital and Employee Compensation Plans - Option Activity (Details)
12 Months Ended
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2016
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share options outstanding, beginning (shares) | shares 1,310,864 1,552,923
Granted (shares) | shares 91,945 45,705
Share options outstanding, ending (shares) | shares 936,123 1,310,864
Outstanding, beginning of period (CAD$ per share) | $ $ 16.81 $ 15.98
Granted (CAD$ per share) | $ 18.64 23.61
Exercised (CAD$ per share) | $ 11.24 12.30
Expired (CAD$ per share) | $ 40.22 24.70
Forfeited (CAD$ per share) | $ 23.60 21.07
Outstanding, end of period (CAD$ per share) | $ $ 16.56 $ 16.81
Long Term Incentive Plan [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Exercised (shares) | shares (307,266) (254,146)
Forfeited (shares) | shares (97,529) (24,266)
Expired (shares) | shares (61,891) (9,352)