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SHARE-BASED PAYMENTS - Share option plan changes (Details) - Share options
Options in Thousands
12 Months Ended
Dec. 31, 2020
Options
USD ($)
$ / shares
Dec. 31, 2020
Options
USD ($)
$ / shares
$ / shares
Dec. 31, 2019
Options
$ / shares
Dec. 31, 2019
Options
$ / shares
$ / shares
Share-based payment transaction        
Balance at January 1 | Options 10,170 10,170 12,344 12,344
Granted 0 0 2,042 2,042
Exercised | Options (2,566) (2,566) (1,577) (1,577)
Forfeited | Options (808) (808) (741) (741)
Expired | Options (1,195) (1,195) (1,898) (1,898)
Outstanding at end of period | Options 5,601 5,601 10,170 10,170
Exercisable at end of period | Options 3,813 3,813 6,459 6,459
Balance at January 1 $ 5.16   $ 5.77  
Granted     4.59  
Exercised 4.90   4.41  
Forfeited 5.02   4.42  
Expired 8.03   9.42  
Outstanding at end of period 4.68   5.16  
Weighted average exercise price exercisable at end of period 4.68 $ 4.68 5.38 $ 5.38
Weighted average share price at the date of exercise | (per share) $ 8.63 $ 7.00 $ 6.20 $ 3.97