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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, 2021 EquityInstruments $ / shares shares | Dec. 31, 2020 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 | 509 | 385
Granted | EquityInstruments | 10 | 132
Exercised | EquityInstruments |  | (7)
Forfeited/expired | shares | (56) | (1)
Outstanding, end of year | EquityInstruments | 463 | 509
Exercisable, end of year | EquityInstruments | 357 | 307
Weighted average exercise price of share options ($ per share) |  |
Weighted average exercise price Outstanding, beginning of year | $ 39.25 | $ 39.83
Weighted average exercise price, Granted | 22.63 | 37.41
Weighted average exercise price, Exercised |  | 36.38
Weighted average exercise price, Forfeited/expired | 37.78 | 39.08
Weighted average exercise price, Outstanding, end of year | 39.06 | 39.25
Weighted average exercise price, Exercisable, end of year | $ 39.68 | $ 39.09

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