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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Stock Options Outstanding and Exercisable (Details) | Dec. 31, 2018 CAD ($) shares year | Dec. 31, 2017 shares | Dec. 31, 2016 shares
--- | --- | --- | ---
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 2,638,749 | 2,976,360 | 3,038,707
Weighted average remaining contractual life (years) | year | 3.6 |  |
Stock options exercisable | shares | 1,491,704 |  |
Weighted average exercise price (C$/option) | $ 9.79 |  |
3.30 - 7.02 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 321,592 |  |
Weighted average remaining contractual life (years) | year | 2.5 |  |
Stock options exercisable | shares | 321,592 |  |
Weighted average exercise price (C$/option) | $ 5.83 |  |
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) | $ 7.02 |  |
7.03 - 7.36 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 630,045 |  |
Weighted average remaining contractual life (years) | year | 3.4 |  |
Stock options exercisable | shares | 401,717 |  |
Weighted average exercise price (C$/option) | $ 7.19 |  |
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) | $ 7.36 |  |
7.37 - 11.95 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 700,836 |  |
Weighted average remaining contractual life (years) | year | 4.3 |  |
Stock options exercisable | shares | 324,536 |  |
Weighted average exercise price (C$/option) | $ 9.05 |  |
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) | $ 11.95 |  |
11.96 - 24.41 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Stock options outstanding | shares | 986,276 |  |
Weighted average remaining contractual life (years) | year | 3.7 |  |
Stock options exercisable | shares | 443,859 |  |
Weighted average exercise price (C$/option) | $ 15.56 |  |
11.96 - 24.41 | 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 - 24.41 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | $ 24.41 |  |

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