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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, 2020 EquityInstruments $ / shares shares | Dec. 31, 2019 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 | 385 | 363
Granted | EquityInstruments | 132 | 112
Exercised | EquityInstruments | (7) | (44)
Forfeited/expired | shares | (1) | (46)
Outstanding, end of year | EquityInstruments | 509 | 385
Exercisable, end of year | EquityInstruments | 307 | 223
Weighted average exercise price of share options ($ per share) |  |
Weighted average exercise price Outstanding, beginning of year | $ 39.83 | $ 38.60
Weighted average exercise price, Granted | 37.41 | 42.95
Weighted average exercise price, Exercised | 36.38 | 34.53
Weighted average exercise price, Forfeited/expired | 39.08 | 42.85
Weighted average exercise price, Outstanding, end of year | 39.25 | 39.83
Weighted average exercise price, Exercisable, end of year | $ 39.09 | $ 37.62

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