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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Changes in Stock Options Issued (Details) | 12 Months Ended
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Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Share-Based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 1,802,623 | 2,638,749
Granted (in shares) | shares | 445,690 | 514,355
Exercised (in shares) | shares | (820,929) | (1,093,844)
Expired (in shares) | shares | (2,622) | (193,167)
Forfeited (in shares) | shares | (19,326) | (63,470)
Outstanding, ending balance (in shares) | shares | 1,405,436 | 1,802,623
Beginning balance (C$ per share) | $ / shares | $ 12.14 | $ 10.35
Granted (C$ per share) | $ / shares | 26.12 | 16.81
Exercised (C$ per share) | $ / shares | 10.86 | (8.78)
Expired (C$ per share) | $ / shares | 14.95 | (18.90)
Forfeited (C$ per share) | $ / shares | 23.53 | (12.81)
Ending balance (C$ per share) | $ / shares | $ 17.16 | $ 12.14

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The weighted average exercise price of share options exercised in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2020-01-01 + Details
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