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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
STOCK-BASED COMPENSATION    
Total intrinsic value of options exercised $ 7,200 $ 10,900
Stock units expected to vest (in shares) 14,463  
Compensation cost charged against income    
Total employee and non-employee share-based compensation expense included in income, before income tax $ 18,362 $ 17,098
Stock Options    
STOCK-BASED COMPENSATION    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 25.78 $ 18.78
Cash received from option exercises $ 6,800 $ 14,000
Total unrecognized compensation expense related to non-vested shares granted to employees $ 76,200  
Cost expected to be recognized over a weighted-average period 2 years 7 months 6 days  
Restricted stock units    
Weighted Average Grant-Date Fair Value    
Granted (in dollars per share) $ 88.96 $ 62.39
Restricted Stock Units and Performance Share Units    
STOCK-BASED COMPENSATION    
Total unrecognized compensation expense related to non-vested shares granted to employees $ 50,300  
Cost expected to be recognized over a weighted-average period 2 years 6 months  
Stock units expected to vest (in shares) 800  
Number of Shares    
Non-vested at the beginning of the period (in shares) 947  
Granted (in shares) 304  
Vested (in shares) (335)  
Forfeited/cancelled (in shares) (1)  
Non-vested at the end of the period (in shares) 915  
Weighted Average Grant-Date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 60.52  
Granted (in dollars per share) 86.28  
Vested (in dollars per share) 62.43  
Forfeited/cancelled (in dollars per share) 62.39  
Non-vested at the end of the period (in dollars per share) $ 68.37  
Performance Share Units    
STOCK-BASED COMPENSATION    
Percentage of Target Performance Level 100.00%  
Performance Share Units | Maximum    
STOCK-BASED COMPENSATION    
Percentage of Target Performance Level 200.00%  
Performance Share Units | Minimum    
STOCK-BASED COMPENSATION    
Percentage of Target Performance Level 0.00%  
Other share-based awards    
STOCK-BASED COMPENSATION    
Total unrecognized compensation expense related to non-vested shares granted to employees $ 1,800  
Cost expected to be recognized over a weighted-average period 1 year 4 months 24 days