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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Compensation cost charged against income              
Operating expenses         $ 70,289 $ 63,356 $ 57,111
Total employee and non-employee share-based compensation expense included in income, before income tax         70,289 63,356 57,111
Less: Amount of income tax benefit recognized in earnings         (15,499) (36,326) (14,892)
Amount charged against net income         54,790 27,030 42,219
Operating expense              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 70,300 $ 63,400 $ 57,100
Stock Options              
STOCK-BASED COMPENSATION              
Weighted-average grant-date fair value of options granted (in dollars per share)         $ 18.82 $ 20.17 $ 22.37
Total intrinsic value of options exercised         $ 68,800 $ 220,200 $ 56,800
Cash received from option exercises         72,900 $ 92,400 $ 25,900
Total unrecognized compensation expense related to non-vested shares granted to employees $ 59,200       $ 59,200    
Cost expected to be recognized over a weighted-average period         2 years 1 month 6 days    
Stock units expected to vest (in shares) 13,463       13,463    
Number of Shares              
Granted (in shares) 12            
Weighted Average Grant-Date Fair Value              
Granted (in dollars per share) $ 77.92            
Restricted stock units              
STOCK-BASED COMPENSATION              
Total unrecognized compensation expense related to non-vested shares granted to employees $ 32,100       $ 32,100    
Cost expected to be recognized over a weighted-average period         2 years 3 months 18 days    
Stock units expected to vest (in shares) 800       800    
Number of Shares              
Non-vested at the beginning of the period (in shares)       825 825    
Granted (in shares) 5 1 17 392      
Vested (in shares)         (287)    
Forfeited/cancelled (in shares)         (6)    
Non-vested at the end of the period (in shares) 947       947 825  
Weighted Average Grant-Date Fair Value              
Non-vested at the beginning of the period (in dollars per share)       $ 57.62 $ 57.62    
Granted (in dollars per share) $ 78.04 $ 71.76 $ 71.72 $ 62.39 62.97 $ 59.79 $ 57.59
Vested (in dollars per share)         55.65    
Forfeited/cancelled (in dollars per share)         64.72    
Non-vested at the end of the period (in dollars per share) $ 60.52       $ 60.52 $ 57.62  
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%    
Incentive Stock Options.              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 9,400 $ 10,000 $ 10,000
Non Qualified Stock Options.              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         58,200 $ 53,400 $ 47,100
Other share-based awards              
STOCK-BASED COMPENSATION              
Total unrecognized compensation expense related to non-vested shares granted to employees $ 2,300       $ 2,300    
Cost expected to be recognized over a weighted-average period         1 year 7 months 6 days    
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 2,700