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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Compensation cost charged against income    
Total employee and non-employee share-based compensation expense included in income, before income tax $ 13,142 $ 10,062
Stock options    
Stock-based compensation    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 18.00 $ 15.88
Total intrinsic value of options exercised $ 32,400 $ 10,500
Cash received from option exercises 13,600 $ 4,000
Total unrecognized compensation expense related to non-vested shares granted to employees $ 111,400  
Cost expected to be recognized over a weighted-average period 3 years 2 months 12 days  
Stock units expected to vest (in shares) 21,438  
Restricted stock units    
Stock-based compensation    
Total unrecognized compensation expense related to non-vested shares granted to employees $ 22,400  
Cost expected to be recognized over a weighted-average period 2 years  
Stock units expected to vest (in shares) 500  
Number of Shares    
Non-vested at the beginning of the period (in shares) 556  
Granted (in shares) 252  
Vested (in shares) (212)  
Forfeited/cancelled (in shares) (2)  
Non-vested at the end of the period (in shares) 594  
Weighted Average Grant-Date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 39.95  
Granted (in dollars per share) 46.27 $ 43.99
Vested (in dollars per share) 39.77  
Forfeited/cancelled (in dollars per share) 20.69  
Non-vested at the end of the period (in dollars per share) $ 42.76