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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, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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)       30.20% 34.70% 36.50%
Risk-free interest rate (as a percent)       2.37% 2.81% 2.11%
Expected term       6 years 6 years 6 years 1 month 6 days
Stock options, Number of Shares            
Balance at the beginning of the period (in shares)     18,890 18,890    
Granted (in shares) 50 52 1,570      
Exercised (in shares)       (5,224)    
Cancelled or forfeited (in shares)       (397)    
Balance at the end of the period (in shares) 14,941     14,941 18,890  
Vested and expected to vest in the future at the end of the period (in shares) 14,205     14,205    
Exercisable at the end of the period (in shares) 7,758     7,758    
Stock options, Weighted-Average Exercise Price Per Share            
Balance at the beginning of the period (in dollars per share)     $ 34.61 $ 34.61    
Granted (in dollars per share) $ 56.39 $ 58.54 $ 59.52      
Exercised (in dollars per share)       17.68    
Cancelled or forfeited (in dollars per share)       50.83    
Balance at the end of the period (in dollars per share) 42.88     42.88 $ 34.61  
Vested and expected to vest in the future at the end of the period (in dollars per share) 42.25     42.25    
Exercisable at the end of the period (in dollars per share) $ 33.70     $ 33.70    
Weighted-Average Remaining Contractual Term (in years)            
Weighted-Average Remaining Contractual Terms (in years)       6 years 3 months 18 days 5 years 9 months 18 days  
Vested and expected to vest in the future at the end of the period       6 years 2 months 12 days    
Exercisable at the end of the period       5 years    
Aggregate Intrinsic Value            
Balance at the beginning of the period     $ 303,627 $ 303,627    
Balance at the end of the period $ 308,884     308,884 $ 303,627  
Vested and expected to vest in the future at the end of the period 302,587     302,587    
Exercisable at the end of the period $ 231,600     $ 231,600