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STOCK-BASED COMPENSATION - Fair Value Assumptions (Details) - Stock options - 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
Weighted-average assumptions used to estimate the fair value of options granted              
Dividend yield (as a percent)         0.00% 0.00% 0.00%
Expected volatility (as a percent)         34.70% 36.50% 36.20%
Risk-free interest rate (as a percent)         2.81% 2.11% 1.57%
Expected term         6 years 6 years 1 month 6 days 6 years 3 months 18 days
Stock Options, Number of Shares              
Balance at the beginning of the period (in shares)       17,819 17,819    
Granted (in shares) 194 11 360 2,615      
Exercised (in shares)         (1,450)    
Cancelled or forfeited (in shares)         (659)    
Balance at the end of the period (in shares) 18,890       18,890 17,819  
Vested and expected to vest in the future at the end of the period (in shares) 18,052       18,052    
Exercisable at the end of the period (in shares) 10,432       10,432    
Stock options, Weighted-Average Exercise Price Per Share              
Balance at the beginning of the period (in dollars per share)       $ 29.62 $ 29.62    
Granted (in dollars per share) $ 55.91 $ 58.77 $ 51.72 $ 58.76      
Exercised (in dollars per share)         19.20    
Cancelled or forfeited (in dollars per share)         45.22    
Balance at the end of the period (in dollars per share) 34.61       34.61 $ 29.62  
Vested and expected to vest in the future at the end of the period (in dollars per share) 33.83       33.83    
Exercisable at the end of the period (in dollars per share) $ 23.10       $ 23.10    
Weighted-Average Remaining Contractual Term (In years)              
Balance at the beginning of the period         5 years 9 months 18 days 6 years 1 month 6 days  
Balance at the end of the period         5 years 9 months 18 days 6 years 1 month 6 days  
Vested and expected to vest in the future at the end of the period         5 years 8 months 12 days    
Exercisable at the end of the period         4 years 1 month 6 days    
Aggregate Intrinsic Value              
Balance at the beginning of the period       $ 600,032 $ 600,032    
Balance at the end of the period $ 303,627       303,627 $ 600,032  
Vested and expected to vest in the future at the end of the period 301,723       301,723    
Exercisable at the end of the period $ 272,636       $ 272,636