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SHARE BASED COMPENSATION - Summary of Stock Option Plans - (Details) shares in Thousands, Option in Thousands | 12 Months Ended
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Dec. 31, 2021 Option $ / shares shares | Dec. 31, 2020 Option $ / shares shares
Number of outstanding share options (shares) |  |
Outstanding, beginning of year | Option | 38,373 | 33,882
Granted | Option | 3,457 | 6,341
Exercised as options for common shares | Option | (245) | (804)
Forfeited/expired | shares | (4,495) | (1,046)
Outstanding, end of year | Option | 37,090 | 38,373
Exercisable, end of year | Option | 28,421 | 26,943
Weighted average exercise price of share options ($ per share) |  |
Outstanding, beginning of year (in dollar per share) | $ 39.65 | $ 39.70
Granted | 22.71 | 38.95
Exercised as options for common shares | 29.82 | 35.73
Forfeited/expired | 37.62 | 39.91
Outstanding, end of year (in dollar per share) | 38.39 | 39.65
Exercisable, end of year (in dollar per share) | $ 39.87 | $ 39.10

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