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SHARE-BASED COMPENSATION - Summary of option activity (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
year
Dec. 31, 2017
USD ($)
shares
year
Options    
Beginning balance outstanding (in shares) | shares 3,326 3,223
Granted (in shares) | shares 642 470
Exercised (in shares) | shares (25) (5)
Forfeited (in shares) | shares (116) (128)
Expired (in shares) | shares (329) (234)
Ending balance outstanding (in shares) | shares 3,498 3,326
Options exercisable (in shares) | shares 2,664 2,536
Weighted– Average Exercise price ($CAD)    
Beginning balance outstanding (in $CAD per share) | $ $ 5.93 $ 6.45
Granted (in $CAD per share) | $ 4.61 6.40
Exercised (in $CAD per share) | $ 3.24 2.75
Forfeited (in $CAD per share) | $ 8.96 11.35
Expired (in $CAD per share) | $ 9.35 10.95
Ending balance outstanding (in $CAD per share) | $ 5.28 5.93
Weighted Average Exercise price exercisable (in $CAD per share) | $ $ 5.42 $ 6.30
Weighted– Average Remaining Contractual Term (Years)    
Beginning balance outstanding | year 5.9 5.7
Granted | year 9.2 9.7
Exercised | year 1.6 7.3
Forfeited | year 3.6 1.8
Ending balance outstanding | year 6.3 5.9
Weighted Average Remaining Contractual Term exercisable | year 5.5 5.1