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SHARE-BASED PAYMENTS - Restricted share units (Details) - Restricted share units
 12 Months Ended
Dec. 31, 2019
CAD ($)
EquityInstruments
$ / shares
Dec. 31, 2018
CAD ($)
EquityInstruments
$ / shares
Dec. 31, 2019
USD ($)
EquityInstruments
Dec. 31, 2018
USD ($)
Share-based payment transaction        
Number of common shares issued when restricted share unit is exercised     1  
Additional consideration to acquire common share | $     $ 0  
Vesting period 3 years      
Summary of information about share units outstanding        
Balance at January 1 7,626,000 8,277,000    
Granted 5,740,000 4,258,000    
Redeemed (3,888,000) (4,247,000)    
Forfeited (966,000) (662,000)    
Outstanding at end of period 8,512,000 7,626,000    
Balance at January 1 | $ $ 4.88 $ 4.63    
Granted | $ / shares $ 4.56 $ 4.85    
Redeemed | $ / shares 4.86 4.37    
Forfeited | $ / shares $ 4.81 $ 4.86    
Outstanding at end of period | $ $ 4.68 $ 4.88    
Liability recognized in respect of cash settled RSUs | $     $ 13,900,000 $ 8,700,000