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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, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
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% 0.00%  
Expected volatility (as a percent) 36.50%   36.20% 36.60% 36.20%  
Risk-free interest rate (as a percent) 1.80%   1.30% 2.10% 1.40%  
Expected term 6 years 1 month 6 days   6 years 4 months 24 days 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)   22,643   22,643    
Granted (in shares) 26 1,319        
Exercised (in shares)       (1,278)    
Cancelled or forfeited (in shares)       (299)    
Balance at the end of the period (in shares) 22,411     22,411   22,643
Vested and expected to vest in the future at the end of the period (in shares) 21,157     21,157    
Exercisable at the end of the period (in shares) 13,135     13,135    
Stock options, Weighted-Average Exercise Price Per Share            
Balance at the beginning of the period (in dollars per share)   $ 23.55   $ 23.55    
Granted (in dollars per share) $ 49.71 $ 45.94        
Exercised (in dollars per share)       14.94    
Cancelled or forfeited (in dollars per share)       40.47    
Balance at the end of the period (in dollars per share) 25.16     25.16   $ 23.55
Vested and expected to vest in the future at the end of the period (in dollars per share) 24.12     24.12    
Exercisable at the end of the period (in dollars per share) $ 14.33     $ 14.33    
Weighted-Average Remaining Contractual Term            
Balance at the beginning of the period       5 years 7 months 6 days   5 years 9 months 18 days
Balance at the end of the period       5 years 7 months 6 days   5 years 9 months 18 days
Vested and expected to vest in the future at the end of the period       5 years 4 months 24 days    
Exercisable at the end of the period       3 years 8 months 12 days    
Aggregate Intrinsic Value            
Balance at the beginning of the period   $ 474,739   $ 474,739    
Balance at the end of the period $ 549,689     549,689   $ 474,739
Vested and expected to vest in the future at the end of the period 540,993     540,993    
Exercisable at the end of the period $ 464,352     $ 464,352