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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, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 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) 35.30%     36.30% 36.60% 36.10%  
Risk-free interest rate (as a percent) 1.70%     1.10% 2.10% 1.40%  
Expected term 5 years 10 months 24 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) 12 26 1,319        
Exercised (in shares)         (1,643)    
Cancelled or forfeited (in shares)         (391)    
Balance at the end of the period (in shares) 21,966       21,966   22,643
Vested and expected to vest in the future at the end of the period (in shares) 20,870       20,870    
Exercisable at the end of the period (in shares) 13,030       13,030    
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) $ 56.08 $ 49.71 $ 45.94        
Exercised (in dollars per share)         16.30    
Cancelled or forfeited (in dollars per share)         39.32    
Balance at the end of the period (in dollars per share) 25.20       25.20   $ 23.55
Vested and expected to vest in the future at the end of the period (in dollars per share) 24.26       24.26    
Exercisable at the end of the period (in dollars per share) $ 14.29       $ 14.29    
Weighted-Average Remaining Contractual Term              
Balance at the beginning of the period         5 years 4 months 24 days   5 years 9 months 18 days
Balance at the end of the period         5 years 4 months 24 days   5 years 9 months 18 days
Vested and expected to vest in the future at the end of the period         5 years 2 months 12 days    
Exercisable at the end of the period         3 years 4 months 24 days    
Aggregate Intrinsic Value              
Balance at the beginning of the period     $ 474,739   $ 474,739    
Balance at the end of the period $ 659,989       659,989   $ 474,739
Vested and expected to vest in the future at the end of the period 646,739       646,739    
Exercisable at the end of the period $ 533,683       $ 533,683