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