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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Stock Options Outstanding and Exercisable (Details)
 12 Months Ended
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options outstanding (in shares) | shares 1,405,436 1,802,623 2,638,749
Weighted average remaining contractual life (years) 4 years 6 months    
Stock options exercisable (in shares) | shares 1,033,700    
Weighted average exercise price (C$/option) $ 15.89    
5.83 - 11.16      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options outstanding (in shares) | shares 415,887    
Weighted average remaining contractual life (years) 2 years 6 months    
Stock options exercisable (in shares) | shares 364,219    
Weighted average exercise price (C$/option) $ 9.27    
11.17 - 17.06      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options outstanding (in shares) | shares 447,821    
Weighted average remaining contractual life (years) 4 years 7 months 6 days    
Stock options exercisable (in shares) | shares 365,793    
Weighted average exercise price (C$/option) $ 15.57    
17.07 - 27.04      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options outstanding (in shares) | shares 431,218    
Weighted average remaining contractual life (years) 5 years 9 months 18 days    
Stock options exercisable (in shares) | shares 286,708    
Weighted average exercise price (C$/option) $ 23.92    
27.05 - 29.09      
Disclosure of range of exercise prices of outstanding share options [line items]      
Number of stock options outstanding (in shares) | shares 110,510    
Weighted average remaining contractual life (years) 6 years 4 months 24 days    
Stock options exercisable (in shares) | shares 16,980    
Weighted average exercise price (C$/option) $ 29.09    
Minimum | 5.83 - 11.16      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 5.83    
Minimum | 11.17 - 17.06      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 11.17    
Minimum | 17.07 - 27.04      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 17.07    
Minimum | 27.05 - 29.09      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 27.05    
Maximum | 5.83 - 11.16      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 11.16    
Maximum | 11.17 - 17.06      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 17.06    
Maximum | 17.07 - 27.04      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 27.04    
Maximum | 27.05 - 29.09      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) $ 29.09