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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 6 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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% 0.00%  
Expected volatility (as a percent) 34.90%   36.50% 34.90% 36.60%  
Risk-free interest rate (as a percent) 2.70%   1.80% 2.80% 2.10%  
Expected term 6 years 1 month 6 days   6 years 1 month 6 days 6 years 1 month 6 days 6 years 1 month 6 days  
Stock Options, Number of Shares            
Balance at the beginning of the period (in shares)   17,819   17,819    
Granted (in shares) 360 2,615        
Exercised (in shares)       (814)    
Cancelled or forfeited (in shares)       (216)    
Balance at the end of the period (in shares) 19,764     19,764   17,819
Vested and expected to vest in the future at the end of the period (in shares) 18,673     18,673    
Exercisable at the end of the period (in shares) 10,639     10,639    
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) $ 51.72 $ 58.76        
Exercised (in dollars per share)       16.73    
Cancelled or forfeited (in dollars per share)       42.60    
Balance at the end of the period (in dollars per share) 34.26     34.26   $ 29.62
Vested and expected to vest in the future at the end of the period (in dollars per share) 33.32     33.32    
Exercisable at the end of the period (in dollars per share) $ 22.40     $ 22.40    
Weighted-Average Remaining Contractual Term            
Balance at the beginning of the period       6 years 2 months 12 days   6 years 1 month 6 days
Balance at the end of the period       6 years 2 months 12 days   6 years 1 month 6 days
Vested and expected to vest in the future at the end of the period       6 years 1 month 6 days    
Exercisable at the end of the period       4 years 6 months    
Aggregate Intrinsic Value            
Balance at the beginning of the period   $ 600,032   $ 600,032    
Balance at the end of the period $ 459,527     459,527   $ 600,032
Vested and expected to vest in the future at the end of the period 451,327     451,327    
Exercisable at the end of the period $ 371,252     $ 371,252