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Share Based Payments - Schedule of Stock Options Outstanding and Exercisable by Range of Exercise Price (Details) | Dec. 31, 2018 year | Dec. 31, 2018 shares | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2015 CAD ($) shares
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |
Number Outstanding (options) | shares |  | 1,249,361 |  |  | 647,156 | 912,995 | 901,114
Weighted Average Remaining Contractual Life (years) | year | 4.99 |  |  |  |  |  |
Weighted Average Exercise Price (cad per share) |  |  | $ 8.73 |  | $ 13.20 | $ 17.42 | $ 20.58
Number Exercisable (options) |  | 777,245 |  | 777,245 | 573,984 | 689,883 |
Weighted Average Exercise Price (cad per share) |  |  | 11.04 |  | $ 14.36 | $ 22.03 |
$2.47 - $3.99 |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |
Number Outstanding (options) | shares |  | 711,827 |  |  |  |  |
Weighted Average Remaining Contractual Life (years) | year | 5.95 |  |  |  |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 3.21 |  |  |  |
Number Exercisable (options) |  |  |  | 442,231 |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 3.25 |  |  |  |
$2.47 - $3.99 | Minimum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 2.47 |  |  |  |
$2.47 - $3.99 | Maximum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 3.99 |  |  |  |
$4.84 - $7.81 |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |
Number Outstanding (options) | shares |  | 335,092 |  |  |  |  |
Weighted Average Remaining Contractual Life (years) | year | 3.76 |  |  |  |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 7.21 |  |  |  |
Number Exercisable (options) |  |  |  | 132,572 |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 7.09 |  |  |  |
$4.84 - $7.81 | Minimum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 4.84 |  |  |  |
$4.84 - $7.81 | Maximum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 7.81 |  |  |  |
$13.77 - $19.00 |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |
Number Outstanding (options) | shares |  | 92,308 |  |  |  |  |
Weighted Average Remaining Contractual Life (years) | year | 4.63 |  |  |  |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 16.94 |  |  |  |
Number Exercisable (options) |  |  |  | 92,308 |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 16.94 |  |  |  |
$13.77 - $19.00 | Minimum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 13.77 |  |  |  |
$13.77 - $19.00 | Maximum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 19 |  |  |  |
$20.23 - $36.96 |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |
Number Outstanding (options) | shares |  | 51,777 |  |  |  |  |
Weighted Average Remaining Contractual Life (years) | year | 2.71 |  |  |  |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 32.29 |  |  |  |
Number Exercisable (options) |  |  |  | 51,777 |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 32.29 |  |  |  |
$20.23 - $36.96 | Minimum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 20.23 |  |  |  |
$20.23 - $36.96 | Maximum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 36.96 |  |  |  |
$38.09 - $63.84 |  |  |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |  |  |
Number Outstanding (options) | shares |  | 58,357 |  |  |  |  |
Weighted Average Remaining Contractual Life (years) | year | 2.93 |  |  |  |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 50.85 |  |  |  |
Number Exercisable (options) |  |  |  | 58,357 |  |  |
Weighted Average Exercise Price (cad per share) |  |  | 50.85 |  |  |  |
$38.09 - $63.84 | Minimum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | 38.09 |  |  |  |
$38.09 - $63.84 | Maximum |  |  |  |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |  |  |  |
Exercise price (cad per share) |  |  | $ 63.84 |  |  |  |

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