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SHARE-BASED PAYMENTS - Restricted performance share units outstanding (Details) - Restricted performance share units
$ / shares in Units, EquityInstruments in Thousands
12 Months Ended
Dec. 31, 2020
CAD ($)
EquityInstruments
$ / shares
Dec. 31, 2019
CAD ($)
EquityInstruments
$ / shares
Share-based payment transaction    
Vesting period 3 years  
Balance at January 1 4,937 4,990
Granted 1,436 2,263
Redeemed (1,575) (1,702)
Forfeited (339) (614)
Outstanding at end of period 4,459 4,937
Balance at January 1 | $ $ 5.16 $ 5.14
Granted | $ / shares $ 7.76 $ 4.54
Redeemed | $ / shares 5.32 4.45
Forfeited | $ / shares $ 5.02 $ 4.71
Outstanding at end of period | $ $ 5.95 $ 5.16