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SHARE-BASED PAYMENTS - Share option plan changes (Details) - Share options
Options in Thousands
12 Months Ended
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