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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Compensation cost charged against income              
Operating expenses         $ 63,356 $ 57,111 $ 52,282
Total employee and non-employee share-based compensation expense included in income, before income tax         63,356 57,111 52,282
Less: Amount of income tax benefit recognized in earnings         (36,326) (14,892) (100,635)
Amount charged against net income         27,030 42,219 (48,353)
Operating expense              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 63,400 $ 57,100 $ 52,300
Stock options              
STOCK-BASED COMPENSATION              
Granted (in shares) 50 52   1,570      
Weighted-average grant-date fair value of options granted (in dollars per share)         $ 20.17 $ 22.37 $ 18.29
Total intrinsic value of options exercised         $ 220,200 $ 56,800 $ 285,800
Cash received from option exercises         92,400 $ 25,900 $ 52,600
Total unrecognized compensation expense related to non-vested shares granted to employees $ 80,300       $ 80,300    
Cost expected to be recognized over a weighted-average period         2 years 3 months 18 days    
Stock units expected to vest (in shares) 14,205       14,205    
Restricted stock units              
STOCK-BASED COMPENSATION              
Total unrecognized compensation expense related to non-vested shares granted to employees $ 29,300       $ 29,300    
Cost expected to be recognized over a weighted-average period         2 years 7 months 6 days    
Stock units expected to vest (in shares) 700       700    
Number of Shares              
Non-vested at the beginning of the period (in shares)       529 529    
Granted (in shares) 1 1 18 548      
Vested (in shares)         (266)    
Forfeited/cancelled (in shares)         (6)    
Non-vested at the end of the period (in shares) 825       825 529  
Weighted Average Grant-Date Fair Value              
Non-vested at the beginning of the period (in dollars per share)       $ 51.55 $ 51.55    
Granted (in dollars per share) $ 55.73 $ 66.00 $ 63.48 $ 59.66 59.79 $ 57.59 $ 46.74
Vested (in dollars per share)         50.12    
Forfeited/cancelled (in dollars per share)         59.67    
Non-vested at the end of the period (in dollars per share) $ 57.62       $ 57.62 $ 51.55  
Incentive Stock Options.              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 10,000 $ 10,000 $ 8,700
Non Qualified Stock Options.              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 53,400 $ 47,100 $ 43,600