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SHARE-BASED PAYMENTS - Restricted performance share units outstanding (Details) - RPSUs EquityInstruments in Thousands | 12 Months Ended
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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

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