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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, 2019
CAD ($)
EquityInstruments
$ / shares
Dec. 31, 2018
CAD ($)
EquityInstruments
$ / shares
Share-based payment transaction    
Balance at January 1 4,990 4,886
Granted 2,263 2,807
Redeemed (1,702) (2,523)
Forfeited (614) (180)
Outstanding at end of period 4,937 4,990
Balance at January 1 | $ $ 5.14 $ 4.52
Granted | $ / shares $ 4.54 $ 4.77
Redeemed | $ / shares 4.45 3.56
Forfeited | $ / shares $ 4.71 $ 4.75
Outstanding at end of period | $ $ 5.16 $ 5.14