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SHARE-BASED PAYMENTS - Share option plan stock options outstanding (Details) - Share options Options in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 Options $ / shares | Dec. 31, 2018 Options $ / shares | Dec. 31, 2017 Options $ / shares
Share options outstanding |  |  |
Exercise price range | $ 4.59 | $ 4.95 |
Number of options | Options | 10,170 | 12,344 | 12,173
Weighted average exercise price | $ 5.16 | $ 5.77 | $ 6.52
Weighted average remaining contractual life (years) | 2 years 11 months 9 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 6,459 | 8,861 |
Weighted average exercise price | $ 5.38 | $ 6.13 |
Weighted average remaining contractual life (years) | 1 year 10 months 21 days |  |
$3.73 to $4.50 |  |  |
Share options outstanding |  |  |
Number of options | Options | 2,313 |  |
Weighted average exercise price | $ 3.90 |  |
Weighted average remaining contractual life (years) | 2 years 2 months 23 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 2,313 |  |
Weighted average exercise price | $ 3.90 |  |
Weighted average remaining contractual life (years) | 2 years 2 months 23 days |  |
$4.51 to $5.50 |  |  |
Share options outstanding |  |  |
Number of options | Options | 5,070 |  |
Weighted average exercise price | $ 4.85 |  |
Weighted average remaining contractual life (years) | 4 years 6 months |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 1,359 |  |
Weighted average exercise price | $ 5.03 |  |
Weighted average remaining contractual life (years) | 3 years 9 months 4 days |  |
$5.51 to $6.50 |  |  |
Share options outstanding |  |  |
Number of options | Options | 1,573 |  |
Weighted average exercise price | $ 5.82 |  |
Weighted average remaining contractual life (years) | 1 year 1 month 21 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 1,573 |  |
Weighted average exercise price | $ 5.82 |  |
Weighted average remaining contractual life (years) | 1 year 1 month 21 days |  |
$6.51 to $8.03 |  |  |
Share options outstanding |  |  |
Number of options | Options | 1,214 |  |
Weighted average exercise price | $ 8.02 |  |
Weighted average remaining contractual life (years) | 1 month 21 days |  |
Share options exercisable |  |  |
Exercisable at end of period | Options | 1,214 |  |
Weighted average exercise price | $ 8.03 |  |
Weighted average remaining contractual life (years) | 1 month 21 days |  |
Minimum | $3.73 to $4.50 |  |  |
Share options outstanding |  |  |
Exercise price range | $ 3.73 |  |
Minimum | $4.51 to $5.50 |  |  |
Share options outstanding |  |  |
Exercise price range | 4.51 |  |
Minimum | $5.51 to $6.50 |  |  |
Share options outstanding |  |  |
Exercise price range | 5.51 |  |
Minimum | $6.51 to $8.03 |  |  |
Share options outstanding |  |  |
Exercise price range | 6.51 |  |
Maximum | $3.73 to $4.50 |  |  |
Share options outstanding |  |  |
Exercise price range | 4.50 |  |
Maximum | $4.51 to $5.50 |  |  |
Share options outstanding |  |  |
Exercise price range | 5.50 |  |
Maximum | $5.51 to $6.50 |  |  |
Share options outstanding |  |  |
Exercise price range | 6.50 |  |
Maximum | $6.51 to $8.03 |  |  |
Share options outstanding |  |  |
Exercise price range | $ 8.03 |  |

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