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Share Capital and Employee Compensation Plans - Options Outstanding and Exercisable (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD ($) shares month | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2015 CAD ($) shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Weighted average exercise price of share options granted in share-based payment arrangement | $ 18.64 | $ 23.61 |
Number Outstanding at Year End (shares) | shares | 936,123 | 1,310,864 | 1,552,923
Weighted Average Remaining Contractual Life (months) | month | 43.64 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 16.56 | $ 16.81 | $ 15.98
Number Exercisable at Year End (shares) | shares | 821,328 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 16.13 |  |
$9.76 - $11.57 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 340,305 |  |
Weighted Average Remaining Contractual Life (months) | month | 55.63 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 10.03 |  |
Number Exercisable at Year End (shares) | shares | 340,305 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 10.03 |  |
$9.76 - $11.57 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 9.76 |  |
$9.76 - $11.57 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 11.57 |  |
$11.58 - $17.01 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 99,742 |  |
Weighted Average Remaining Contractual Life (months) | month | 50.99 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 11.81 |  |
Number Exercisable at Year End (shares) | shares | 99,742 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 11.81 |  |
$11.58 - $17.01 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 11.58 |  |
$11.58 - $17.01 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 17.01 |  |
$17.02 - $18.53 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 124,188 |  |
Weighted Average Remaining Contractual Life (months) | month | 26.42 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 18.38 |  |
Number Exercisable at Year End (shares) | shares | 124,188 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 18.38 |  |
$17.02 - $18.53 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 17.02 |  |
$17.02 - $18.53 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 18.53 |  |
$18.54 - $24.90 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number Outstanding at Year End (shares) | shares | 371,888 |  |
Weighted Average Remaining Contractual Life (months) | month | 36.44 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 23.19 |  |
Number Exercisable at Year End (shares) | shares | 257,093 |  |
Weighted Average Exercise Price (CAD$ per share) | $ 24.79 |  |
$18.54 - $24.90 [member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 18.54 |  |
$18.54 - $24.90 [member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 24.90 |  |

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