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STOCK PLANS (Details 2)
 6 Months Ended
Jun. 30, 2017
$ / shares
shares
Stock Incentive Plans  
Shares issued under employee stock purchase plan (shares) | shares 35,745
Weighted average fair value (in dollars per share) | $ / shares $ 20.98
Employee Stock Option  
Stock Incentive Plans  
Outstanding beginning of period (in shares) | shares 5,207,743
Granted (in shares) | shares 933,000
Exercised (in shares) | shares (214,474)
Forfeited (in shares) | shares (286,978)
Expired (in shares) | shares (83,589)
Outstanding end of period (in shares) | shares 5,555,702
Outstanding beginning of period (in dollars per share) | $ / shares $ 42.16
Granted (in dollars per share) | $ / shares 44.41
Exercised (in dollars per share) | $ / shares 12.19
Forfeited (in dollars per share) | $ / shares 52.05
Expired (in dollars per share) | $ / shares 80.43
Outstanding at end of period (in dollars per share) | $ / shares $ 42.61