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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Activity of Outstanding Units Other than Options (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Deferred Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 (in units) | 613,617 | 533,698
Granted (in units) | 63,089 | 79,919
Issued in connection with Alacer acquisition (in units) | 234,440 | 0
Redeemed / Settled (in units) | (163,161) | 0
Outstanding, December 31 (in units) | 747,985 | 613,617
Restricted Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 (in units) | 356,160 | 425,095
Granted (in units) | 145,987 | 195,530
Issued in connection with Alacer acquisition (in units) | 998,901 | 0
Redeemed / Settled (in units) | (719,345) | (200,671)
Forfeited (in units) | (32,838) | (63,794)
Outstanding, December 31 (in units) | 748,865 | 356,160
Performance Share Units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, January 1 (in units) | 308,500 | 311,100
Granted (in units) | 222,045 | 144,500
Issued in connection with Alacer acquisition (in units) | 985,489 | 0
Redeemed / Settled (in units) | (402,198) | (122,300)
Forfeited (in units) | 0 | (24,800)
Outstanding, December 31 (in units) | 1,113,836 | 308,500

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