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SHARE-BASED PAYMENTS - Restricted performance share units outstanding (Details) - RPSUs
EquityInstruments in Thousands
12 Months Ended
Dec. 31, 2017
CAD ($)
EquityInstruments
Dec. 31, 2016
CAD ($)
EquityInstruments
Share-based payment transaction    
Vesting period 3 years  
Summary of information about share units outstanding    
Balance at January 1 | EquityInstruments 4,993 4,313
Granted | EquityInstruments 1,209 1,887
Redeemed | EquityInstruments (889) (495)
Forfeited | EquityInstruments (427) (712)
Outstanding at end of period | EquityInstruments 4,886 4,993
Balance at January 1 | $ $ 4.51 $ 4.88
Granted | $ 5.32 4.47
Redeemed | $ 5.39 6.55
Forfeited | $ 4.81 5.20
Outstanding at end of period | $ $ 4.52 $ 4.51