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STOCK PLANS (Details 2)
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Weighted Average Exercise Price  
Weighted average fair value (in dollars per share) $ 18.85
Employee Stock Option  
Number of Options  
Outstanding beginning of period (in shares) | shares 4,951,493
Granted (in shares) | shares 1,683,007
Exercised (in shares) | shares (103,263)
Forfeited (in shares) | shares (242,188)
Expired (in shares) | shares (253,483)
Outstanding end of period (in shares) | shares 6,035,566
Weighted Average Exercise Price  
Outstanding beginning of period (in dollars per share) $ 43.51
Granted (in dollars per share) 38.33
Exercised (in dollars per share) 14.45
Forfeited (in dollars per share) 44.43
Expired (in dollars per share) 64.19
Outstanding at end of period (in dollars per share) $ 41.65