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SHARE CAPITAL AND SHARE-BASED PAYMENTS - Stock Options Outstanding and Exercisable (Details)
Dec. 31, 2017
CAD ($)
year
shares
Dec. 31, 2016
shares
Dec. 31, 2015
shares
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 2,976,360 3,038,707 3,193,106
Weighted average remaining contractual life (years) | year 3.9    
Stock options exercisable | shares 1,650,549    
Weighted average exercise price (C$/option) $ 9.63    
3.30 - 7.02      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 585,719    
Weighted average remaining contractual life (years) | year 3.3    
Stock options exercisable | shares 382,281    
Weighted average exercise price (C$/option) $ 5.53    
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 800,162    
Weighted average remaining contractual life (years) | year 4.4    
Stock options exercisable | shares 308,411    
Weighted average exercise price (C$/option) $ 7.22    
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 758,815    
Weighted average remaining contractual life (years) | year 3.7    
Stock options exercisable | shares 592,148    
Weighted average exercise price (C$/option) $ 9.11    
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 - 28.78      
Disclosure of range of exercise prices of outstanding share options [line items]      
Stock options outstanding | shares 831,664    
Weighted average remaining contractual life (years) | year 3.9    
Stock options exercisable | shares 367,709    
Weighted average exercise price (C$/option) $ 16.75    
11.96 - 28.78 | 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 - 28.78 | Maximum      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price, share options outstanding (C$ per share) $ 28.78