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SHARE BASED COMPENSATION - Stock Appreciation Rights - (Details) shares in Thousands, EquityInstruments in Thousands | 12 Months Ended
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Dec. 31, 2019 EquityInstruments $ / shares shares | Dec. 31, 2018 EquityInstruments $ / shares shares
SHARE BASED COMPENSATION |  |
Option term (expiration period) | 7 years |
Vesting period | 3 years |
Stock Appreciation Rights (SARs) |  |
Number Of Outstanding Share Options [Abstract] |  |
Outstanding, beginning of year | EquityInstruments | 363 | 387
Granted | EquityInstruments | 112 | 108
Exercised | EquityInstruments | (44) | (126)
Forfeited/expired | shares | (46) | (6)
Outstanding, end of year | EquityInstruments | 385 | 363
Exercisable, end of year | EquityInstruments | 223 | 170
Weighted average exercise price of share options ($ per share) |  |
Weighted average exercise price Outstanding, beginning of year | $ 38.60 | $ 36.38
Weighted average exercise price, Granted | 42.95 | 43.09
Weighted average exercise price, Exercised | 34.53 | 35.65
Weighted average exercise price, Forfeited/expired | 42.85 | 38.36
Weighted average exercise price, Outstanding, end of year | 39.83 | 38.60
Weighted average exercise price, Exercisable, end of year | $ 37.62 | $ 36.57

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