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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Compensation cost charged against income    
Total employee and non-employee share-based compensation expense included in income, before income tax $ 17,098 $ 15,324
Stock Options    
STOCK-BASED COMPENSATION    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 18.78 $ 20.30
Total intrinsic value of options exercised $ 10,900 $ 178,500
Cash received from option exercises 14,000 $ 35,200
Total unrecognized compensation expense related to non-vested shares granted to employees $ 86,800  
Cost expected to be recognized over a weighted-average period 2 years 8 months 12 days  
Stock units expected to vest (in shares) 14,755  
Restricted Stock Units and Performance Share Units    
STOCK-BASED COMPENSATION    
Total unrecognized compensation expense related to non-vested shares granted to employees $ 47,200  
Cost expected to be recognized over a weighted-average period 2 years 10 months 24 days  
Stock units expected to vest (in shares) 800  
Number of Shares    
Non-vested at the beginning of the period (in shares) 825  
Granted (in shares) 392  
Vested (in shares) (271)  
Forfeited/cancelled (in shares) (1)  
Non-vested at the end of the period (in shares) 945  
Weighted Average Grant-Date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 57.62  
Granted (in dollars per share) 62.39 $ 59.66
Vested (in dollars per share) 55.53  
Forfeited/cancelled (in dollars per share) 59.67  
Non-vested at the end of the period (in dollars per share) $ 60.21  
Performance Share Units    
STOCK-BASED COMPENSATION    
Percentage of Target Performance Level 100.00%  
Number of Shares    
Granted (in shares)   0
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%