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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Stock Options Outstanding and Exercisable (Details)
Dec. 31, 2018
CAD ($)
shares
year
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 2,638,749 2,976,360 3,038,707
Weighted average remaining contractual life (years) | year 3.6    
Stock options exercisable | shares 1,491,704    
Weighted average exercise price (C$/option) $ 9.79    
3.30 - 7.02      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 321,592    
Weighted average remaining contractual life (years) | year 2.5    
Stock options exercisable | shares 321,592    
Weighted average exercise price (C$/option) $ 5.83    
3.30 - 7.02 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 3.30    
3.30 - 7.02 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) $ 7.02    
7.03 - 7.36      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 630,045    
Weighted average remaining contractual life (years) | year 3.4    
Stock options exercisable | shares 401,717    
Weighted average exercise price (C$/option) $ 7.19    
7.03 - 7.36 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 7.03    
7.03 - 7.36 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) $ 7.36    
7.37 - 11.95      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 700,836    
Weighted average remaining contractual life (years) | year 4.3    
Stock options exercisable | shares 324,536    
Weighted average exercise price (C$/option) $ 9.05    
7.37 - 11.95 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 7.37    
7.37 - 11.95 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) $ 11.95    
11.96 - 24.41      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 986,276    
Weighted average remaining contractual life (years) | year 3.7    
Stock options exercisable | shares 443,859    
Weighted average exercise price (C$/option) $ 15.56    
11.96 - 24.41 | Minimum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) 11.96    
11.96 - 24.41 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) $ 24.41