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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
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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

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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