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SHARE CAPITAL - Stock options (Details)
12 Months Ended
Jun. 18, 2015
shares
Dec. 31, 2017
CAD ($)
Options
Y
Dec. 31, 2016
CAD ($)
Options
Y
Dec. 31, 2015
CAD ($)
Options
Y
Dec. 31, 2014
Y
Stock options          
Options available for grant | shares 10,515,860        
Options available for grant, as a percent to outstanding shares 20.00%        
Number of options outstanding | Options   7,874,704 8,134,703 9,346,389  
Number of options granted | Options   1,844,500 170,061 1,423,677  
Number of options exercised | Options   (2,174,093) (101,398) (2,507,603)  
Number of options forfeited | Options   (471,867) (271,862) (127,760)  
Number of options expired | Options   (1,294,934) (56,800)    
Number of options outstanding | Options   5,778,310 7,874,704 8,134,703  
Number of options exercisable | Options   4,512,878 6,800,066 6,491,040  
Weighted average exercise price of share options outstanding at beginning of year | $   $ 3.91 $ 3.92 $ 2.37  
Weighted average exercise price of share options granted | $   1.90 4.90 8.57  
Weighted average exercise price of share options exercised | $   1.04 1.00 0.53  
Weighted average exercise price of share options forfeited | $   4.74 6.37 8.46  
Weighted average exercise price of share options expired | $   1.42 1.00    
Weighted average exercise price of share options outstanding at end of year | $   4.84 3.91 3.92  
Weighted average exercise price of share options exercisable | $   $ 4.99 $ 3.40 $ 3.15  
Average remaining contractual life of outstanding share options (in years) | Y   2.28 1.52 2.22 2.19
Average remaining contractual life of exercisable share options (in years)   1 year 11 months 9 days 1 year 3 months 4 days 1 year 9 months 11 days  
Stock options          
Stock options          
Maximum life of options   10 years