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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Compensation cost charged against income              
Operating expenses         $ 57,111 $ 52,282 $ 45,848
Total employee and non-employee share-based compensation expense included in income, before income tax         57,111 52,282 45,848
Less: Amount of income tax benefit recognized in earnings         (14,892) (100,635) (34,909)
Amount charged against net income         42,219 (48,353) 10,939
Operating expense              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 57,100 $ 52,300 $ 45,800
Stock options              
STOCK-BASED COMPENSATION              
Weighted-average grant-date fair value of options granted (in dollars per share)         $ 22.37 $ 18.29 $ 16.90
Total intrinsic value of options exercised         $ 56,800 $ 285,800 $ 70,600
Cash received from option exercises         25,900 $ 52,600 $ 16,400
Total unrecognized compensation expense related to non-vested shares granted to employees $ 98,700       $ 98,700    
Cost expected to be recognized over a weighted-average period         2 years 7 months 6 days    
Stock units expected to vest (in shares) 18,052       18,052    
Restricted stock units              
STOCK-BASED COMPENSATION              
Total unrecognized compensation expense related to non-vested shares granted to employees $ 15,700       $ 15,700    
Cost expected to be recognized over a weighted-average period         1 year 7 months 6 days    
Stock units expected to vest (in shares) 500       500    
Number of Shares              
Non-vested at the beginning of the period (in shares)       530 530    
Granted (in shares) 1 1 48 221      
Vested (in shares)         (265)    
Forfeited/cancelled (in shares)         (7)    
Non-vested at the end of the period (in shares) 529       529 530  
Weighted Average Grant-Date Fair Value              
Non-vested at the beginning of the period (in dollars per share)       $ 45.09 $ 45.09    
Granted (in dollars per share) $ 56.19 $ 58.72 $ 52.31 $ 58.75 57.59 $ 46.74 $ 44.71
Vested (in dollars per share)         45.26    
Forfeited/cancelled (in dollars per share)         33.60    
Non-vested at the end of the period (in dollars per share) $ 51.55       $ 51.55 $ 45.09  
ISO              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 10,000 $ 8,700 $ 8,000
NSO              
Compensation cost charged against income              
Total employee and non-employee share-based compensation expense included in income, before income tax         $ 47,100 $ 43,600 $ 37,800