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STOCK-BASED COMPENSATION - Restricted and Deferred Share Unit Activity (Details) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Restricted share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, beginning of year | 2,237,085 | 2,484,405
Granted and reinvested dividends | 826,081 | 763,364
Exercised | (984,342) | (826,918)
Forfeited | (266,979) | (183,766)
Outstanding, end of year | 1,811,845.000000 | 2,237,085
Deferred share units |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Outstanding, beginning of year | 2,396,458 | 1,770,871
Granted and reinvested dividends | 735,117 | 972,894
Exercised | (333,111) | (132,620)
Forfeited | (470,817) | (214,687)
Outstanding, end of year | 2,327,647.000000 | 2,396,458

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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 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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