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SHARE-BASED PAYMENTS - Share option plan changes (Details) - Share options Options in Thousands | 12 Months Ended
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Dec. 31, 2019 Options $ / shares | Dec. 31, 2019 Options $ / shares $ / shares | Dec. 31, 2018 Options $ / shares | Dec. 31, 2018 Options $ / shares $ / shares
Share-based payment transaction |  |  |  |
Balance at January 1 | Options | 12,344 | 12,344 | 12,173 | 12,173
Granted | Options | 2,042 | 2,042 | 1,950 | 1,950
Exercised | Options | (1,577) | (1,577) | (301) | (301)
Forfeited | Options | (741) | (741) | (238) | (238)
Expired | Options | (1,898) | (1,898) | (1,240) | (1,240)
Outstanding at end of period | Options | 10,170 | 10,170 | 12,344 | 12,344
Exercisable at end of period | Options | 6,459 | 6,459 | 8,861 | 8,861
Balance at January 1 | $ / shares | $ 5.77 |  | $ 6.52 |
Granted | $ / shares | 4.59 |  | 4.95 |
Exercised | $ / shares | 4.41 |  | 3.65 |
Forfeited | $ / shares | 4.42 |  | 4.87 |
Expired | $ / shares | 9.42 |  | 12.58 |
Outstanding at end of period | $ / shares | 5.16 |  | 5.77 |
Weighted average exercise price at end of period | $ / shares | 5.38 | $ 5.38 | $ 6.13 | $ 6.13
Weighted average share price at the date of exercise | (per share) | $ 6.20 | $ 3.97 |  | $ 3.44

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