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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Stock Options Outstanding and Exercisable (Details) | Dec. 31, 2017 CAD year shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares
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Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 2,976,360 | 3,038,707 | 3,193,106
Weighted average remaining contractual life (years) | year | 3.9 |  |
Stock options exercisable | shares | 1,650,549 |  |
Weighted average exercise price (C$/option) | CAD 9.63 |  |
3.30 - 7.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 585,719 |  |
Weighted average remaining contractual life (years) | year | 3.3 |  |
Stock options exercisable | shares | 382,281 |  |
Weighted average exercise price (C$/option) | CAD 5.53 |  |
3.30 - 7.02 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 3.30 |  |
3.30 - 7.02 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | CAD 7.02 |  |
7.03 - 7.36 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 800,162 |  |
Weighted average remaining contractual life (years) | year | 4.4 |  |
Stock options exercisable | shares | 308,411 |  |
Weighted average exercise price (C$/option) | CAD 7.22 |  |
7.03 - 7.36 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 7.03 |  |
7.03 - 7.36 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | CAD 7.36 |  |
7.37 - 11.95 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 758,815 |  |
Weighted average remaining contractual life (years) | year | 3.7 |  |
Stock options exercisable | shares | 592,148 |  |
Weighted average exercise price (C$/option) | CAD 9.11 |  |
7.37 - 11.95 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 7.37 |  |
7.37 - 11.95 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | CAD 11.95 |  |
11.96 - 28.78 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 831,664 |  |
Weighted average remaining contractual life (years) | year | 3.9 |  |
Stock options exercisable | shares | 367,709 |  |
Weighted average exercise price (C$/option) | CAD 16.75 |  |
11.96 - 28.78 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 11.96 |  |
11.96 - 28.78 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | CAD 28.78 |  |

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