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SHARE-BASED COMPENSATION AND BENEFIT PLANS (Summary of Stock Options) (Details) - Stock option - Employee stock option [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Share-Based Compensation and Benefit Plans  
Outstanding at December 31, 2020, shares | shares 1,500
Outstanding at December 31, 2020, weighted-average exercise price | $ / shares $ 248.52
Granted, shares | shares 99
Granted, weighted-average exercise price | $ / shares $ 459.47
Exercised, shares | shares (76)
Exercised, weighted-average exercise price | $ / shares $ 129.13
Forfeited or expired, shares | shares (4)
Forfeited or expired, weighted-average exercise price | $ / shares $ 325.26
Outstanding at March 31, 2021, shares | shares 1,519
Outstanding at March 31, 2021, weighted-average exercise price | $ / shares $ 268.10
Exercisable at March 31, 2021, shares | shares 1,063
Exercisable at March 31, 2021, weighted-average exercise price | $ / shares $ 222.51