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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 9 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Weighted-average assumptions used to estimate the fair value of options granted            
Dividend yield (as a percent) 0.00%   0.00% 0.00% 0.00%  
Expected volatility (as a percent) 30.20%   34.50% 30.20% 34.90%  
Risk-free interest rate (as a percent) 1.40%   2.90% 2.40% 2.80%  
Expected term 5 years 9 months 18 days   6 years 1 month 6 days 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) 52 1,570        
Exercised (in shares)       (4,999)    
Cancelled or forfeited (in shares)       (373)    
Balance at the end of the period (in shares) 15,140     15,140   18,890
Vested and expected to vest in the future at the end of the period (in shares) 14,290     14,290    
Exercisable at the end of the period (in shares) 7,557     7,557    
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)   $ 59.52        
Exercised (in dollars per share)       17.05    
Cancelled or forfeited (in dollars per share)       50.42    
Balance at the end of the period (in dollars per share) $ 42.69     42.69   $ 34.61
Vested and expected to vest in the future at the end of the period (in dollars per share) 41.98     41.98    
Exercisable at the end of the period (in dollars per share) $ 33.14     $ 33.14    
Weighted-Average Remaining Contractual Term (in years)            
Balance at the beginning of the period       6 years 6 months   5 years 9 months 18 days
Balance at the end of the period       6 years 6 months   5 years 9 months 18 days
Vested and expected to vest in the future at the end of the period       6 years 4 months 24 days    
Exercisable at the end of the period       5 years 2 months 12 days    
Aggregate Intrinsic Value            
Balance at the beginning of the period   $ 303,627   $ 303,627    
Balance at the end of the period $ 237,041     237,041   $ 303,627
Vested and expected to vest in the future at the end of the period 233,489     233,489    
Exercisable at the end of the period $ 188,583     $ 188,583