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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, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares
Share-Based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 2,976,360 | 3,038,707
Granted (in shares) | shares | 668,664 | 489,305
Exercised (in shares) | shares | (899,050) | (440,317)
Expired (in shares) | shares | (56,700) | 0
Forfeited (in shares) | shares | (50,525) | (111,335)
Outstanding, ending balance (in shares) | shares | 2,638,749 | 2,976,360
Beginning balance (C$ per share) | $ | $ 9.35 | $ 8.52
Granted (C$ per share) | $ | 11.84 | 12.50
Exercised (C$ per share) | $ | (7.79) | (6.60)
Expired (C$ per share) | $ | (14.15) | (0.00)
Forfeited (C$ per share) | $ | (12.70) | (11.25)
Ending balance (C$ per share) | $ | $ 10.35 | $ 9.35

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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 2018-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_iv&doctype=Standard -URIDate 2018-03-16 + Details
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