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STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Activity) (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Service Based Awards | Equity Classified Award | Equity-Settled Award | Restricted Stock  
Number of Shares   
Unvested awards outstanding at period start (in shares) | shares 9
Awards granted (in shares) | shares 0
Awards modified (in shares) | shares 0
Awards vested (in shares) | shares 0
Awards forfeited/cancelled (in shares) | shares 0
Unvested awards outstanding at period end (in shares) | shares 9
Weighted Average Grant Date Fair Value Per Share   
Unvested awards outstanding at period start (in usd per share) | $ / shares $ 167.18
Awards granted (in usd per share) | $ / shares 0
Awards modified (in usd per share) | $ / shares 0
Awards vested (in usd per share) | $ / shares 0
Awards forfeited/cancelled (in usd per share) | $ / shares 0
Unvested awards outstanding at period end (in usd per share) | $ / shares $ 167.18
Service Based Awards | Equity Classified Award | Equity-Settled Award | Restricted Stock Units  
Number of Shares   
Unvested awards outstanding at period start (in shares) | shares 576
Awards granted (in shares) | shares 366
Awards modified (in shares) | shares (3)
Awards vested (in shares) | shares (193)
Awards forfeited/cancelled (in shares) | shares (5)
Unvested awards outstanding at period end (in shares) | shares 741
Weighted Average Grant Date Fair Value Per Share   
Unvested awards outstanding at period start (in usd per share) | $ / shares $ 277.38
Awards granted (in usd per share) | $ / shares 278.53
Awards modified (in usd per share) | $ / shares 387.74
Awards vested (in usd per share) | $ / shares 199.32
Awards forfeited/cancelled (in usd per share) | $ / shares 368.35
Unvested awards outstanding at period end (in usd per share) | $ / shares $ 297.23
Service Based Awards | Liability Classified Award | Cash-Settled Award | Restricted Stock Units  
Number of Shares   
Unvested awards outstanding at period start (in shares) | shares 112
Awards granted (in shares) | shares 42
Awards modified (in shares) | shares 3
Awards vested (in shares) | shares (52)
Awards forfeited/cancelled (in shares) | shares 0
Unvested awards outstanding at period end (in shares) | shares 105
Weighted Average Grant Date Fair Value Per Share   
Unvested awards outstanding at period start (in usd per share) | $ / shares $ 217.28
Awards granted (in usd per share) | $ / shares 266.75
Awards modified (in usd per share) | $ / shares 220.00
Awards vested (in usd per share) | $ / shares 181.18
Awards forfeited/cancelled (in usd per share) | $ / shares 253.51
Unvested awards outstanding at period end (in usd per share) | $ / shares $ 254.85
Performance Based Awards | Equity Classified Award | Equity-Settled Award | Restricted Stock  
Number of Shares   
Unvested awards outstanding at period start (in shares) | shares 9
Awards granted (in shares) | shares 0
Unvested awards outstanding at period end (in shares) | shares 9
Weighted Average Grant Date Fair Value Per Share   
Unvested awards outstanding at period start (in usd per share) | $ / shares $ 165.87
Awards granted (in usd per share) | $ / shares 0
Unvested awards outstanding at period end (in usd per share) | $ / shares $ 165.87
Performance Based Awards | Equity Classified Award | Equity-Settled Award | Restricted Stock Units  
Number of Shares   
Unvested awards outstanding at period start (in shares) | shares 23
Awards granted (in shares) | shares 1
Unvested awards outstanding at period end (in shares) | shares 24
Weighted Average Grant Date Fair Value Per Share   
Unvested awards outstanding at period start (in usd per share) | $ / shares $ 339.69
Awards granted (in usd per share) | $ / shares 556.68
Unvested awards outstanding at period end (in usd per share) | $ / shares $ 344.04