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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Stock Options Outstanding and Exercisable (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options outstanding (in shares) | shares | 1,405,436 | 1,802,623 | 2,638,749
Weighted average remaining contractual life (years) | 4 years 6 months |  |
Stock options exercisable (in shares) | shares | 1,033,700 |  |
Weighted average exercise price (C$/option) | $ 15.89 |  |
5.83 - 11.16 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options outstanding (in shares) | shares | 415,887 |  |
Weighted average remaining contractual life (years) | 2 years 6 months |  |
Stock options exercisable (in shares) | shares | 364,219 |  |
Weighted average exercise price (C$/option) | $ 9.27 |  |
11.17 - 17.06 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options outstanding (in shares) | shares | 447,821 |  |
Weighted average remaining contractual life (years) | 4 years 7 months 6 days |  |
Stock options exercisable (in shares) | shares | 365,793 |  |
Weighted average exercise price (C$/option) | $ 15.57 |  |
17.07 - 27.04 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options outstanding (in shares) | shares | 431,218 |  |
Weighted average remaining contractual life (years) | 5 years 9 months 18 days |  |
Stock options exercisable (in shares) | shares | 286,708 |  |
Weighted average exercise price (C$/option) | $ 23.92 |  |
27.05 - 29.09 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Number of stock options outstanding (in shares) | shares | 110,510 |  |
Weighted average remaining contractual life (years) | 6 years 4 months 24 days |  |
Stock options exercisable (in shares) | shares | 16,980 |  |
Weighted average exercise price (C$/option) | $ 29.09 |  |
Minimum | 5.83 - 11.16 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 5.83 |  |
Minimum | 11.17 - 17.06 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 11.17 |  |
Minimum | 17.07 - 27.04 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 17.07 |  |
Minimum | 27.05 - 29.09 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 27.05 |  |
Maximum | 5.83 - 11.16 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 11.16 |  |
Maximum | 11.17 - 17.06 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 17.06 |  |
Maximum | 17.07 - 27.04 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | 27.04 |  |
Maximum | 27.05 - 29.09 |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price, share options outstanding (C$ per share) | $ 29.09 |  |

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