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STOCK-BASED COMPENSATION (Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding  
Number of shares outstanding beginning balance | shares 9,041
Number of shares granted | shares 2,454
Number of shares exercised | shares (1,590)
Number of shares forfeited | shares (229)
Number of shares outstanding ending balance | shares 9,676
Number of shares exercisable | shares 3,749
Number of shares expected to vest | shares 5,927
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price  
Weighted average exercise price per share outstanding beginning balance | $ / shares $ 23.40
Weighted average exercise price per share granted | $ / shares 46.54
Weighted average exercise price per share exercised | $ / shares 20.98
Weighted average exercise price per share forfeited | $ / shares 27.23
Weighted average exercise price per share outstanding ending balance | $ / shares 29.57
Weighted average exercise price per share exercisable | $ / shares 21.54
Weighted average exercise price per share expected to vest | $ / shares $ 34.66
Weighted average remaining contractual life outstanding 8 years
Weighted average remaining contractual life exercisable 6 years 4 months 12 days
Weighted average remaining contractual life expected to vest 9 years
Aggregate intrinsic value outstanding | $ $ 202,872
Aggregate intrinsic value exercisable | $ 108,384
Aggregate intrinsic value expected to vest | $ $ 94,488