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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, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
Share-Based Payment Arrangements [Abstract] |  |
Outstanding, beginning balance (in shares) | shares | 3,038,707 | 3,193,106
Granted (in shares) | shares | 489,305 | 798,020
Assumed in connection with the acquisition (in shares) | shares | 0 | 809,286
Exercised (in shares) | shares | (440,317) | (1,181,387)
Forfeited (in shares) | shares | (111,335) | (580,318)
Outstanding, ending balance (in shares) | shares | 2,976,360 | 3,038,707
Beginning balance (C$ per share) | $ | $ 8.52 | $ 8.97
Granted (C$ per share) | $ | 12.50 | 7.19
Assumed in connection with the acquisition (C$ per share) | $ | 0.00 | 6.35
Exercised (C$ per share) | $ | (6.60) | (7.28)
Forfeited (C$ per share) | $ | (11.25) | (8.70)
Ending balance (C$ per share) | $ | $ 9.35 | $ 8.52

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