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Share Capital and Employee Compensation Plans - Option Activity (Details) | 12 Months Ended
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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)

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