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SHARE-BASED PAYMENTS - Share option plan stock options outstanding (Details) - Share options Options in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD ($) Options | Dec. 31, 2016 CAD ($) Options | Dec. 31, 2015 CAD ($) Options
Share options outstanding |  |  |
Number of options | Options | 12,173 | 12,429 | 13,513
Weighted average exercise price | $ 6.52 | $ 6.95 | $ 7.57
Weighted average remaining contractual life (years) | 3 years 2 months 16 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 8,539 | 7,911 |
Weighted average exercise price | $ 7.41 | $ 8.51 |
Weighted average remaining contractual life (years) | 2 years 4 months 10 days |  |
$2.96 - $4.22 |  |  |
Share options outstanding |  |  |
Number of options | Options | 4,169 |  |
Weighted average exercise price | $ 3.87 |  |
Weighted average remaining contractual life (years) | 4 years 1 month 13 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 2,151 |  |
Weighted average exercise price | $ 3.81 |  |
Weighted average remaining contractual life (years) | 3 years 9 months 22 days |  |
$4.23 - $9.53 |  |  |
Share options outstanding |  |  |
Number of options | Options | 6,145 |  |
Weighted average exercise price | $ 6.41 |  |
Weighted average remaining contractual life (years) | 3 years 3 months 26 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 4,528 |  |
Weighted average exercise price | $ 6.89 |  |
Weighted average remaining contractual life (years) | 2 years 3 months 22 days |  |
$9.54 - $14.31 |  |  |
Share options outstanding |  |  |
Number of options | Options | 1,140 |  |
Weighted average exercise price | $ 10.70 |  |
Weighted average remaining contractual life (years) | 1 year 2 months 12 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 1,141 |  |
Weighted average exercise price | $ 10.70 |  |
Weighted average remaining contractual life (years) | 1 year 2 months 12 days |  |
$14.32 - $16.25 |  |  |
Share options outstanding |  |  |
Number of options | Options | 719 |  |
Weighted average exercise price | $ 16.25 |  |
Weighted average remaining contractual life (years) | 1 month 24 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 719 |  |
Weighted average exercise price | $ 16.25 |  |
Weighted average remaining contractual life (years) | 1 month 24 days |  |
Minimum | $2.96 - $4.22 |  |  |
Share options outstanding |  |  |
Exercise price range | $ 2.96 |  |
Minimum | $4.23 - $9.53 |  |  |
Share options outstanding |  |  |
Exercise price range | 4.23 |  |
Minimum | $9.54 - $14.31 |  |  |
Share options outstanding |  |  |
Exercise price range | 9.54 |  |
Minimum | $14.32 - $16.25 |  |  |
Share options outstanding |  |  |
Exercise price range | 14.32 |  |
Maximum | $2.96 - $4.22 |  |  |
Share options outstanding |  |  |
Exercise price range | 4.22 |  |
Maximum | $4.23 - $9.53 |  |  |
Share options outstanding |  |  |
Exercise price range | 9.53 |  |
Maximum | $9.54 - $14.31 |  |  |
Share options outstanding |  |  |
Exercise price range | 14.31 |  |
Maximum | $14.32 - $16.25 |  |  |
Share options outstanding |  |  |
Exercise price range | $ 16.25 |  |

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