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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Changes in Stock Options Issued (Details)
 12 Months Ended
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