STOCK PLANS (Details 3) (Stock options, USD $)	6 Months Ended
	Jun. 30, 2014
Stock options
Number of Shares
Balance at the beginning of the period (in shares)	3,840,038
Granted (in shares)	1,458,200
Exercised (in shares)	(326,290)
Forfeited (in shares)	(86,753)
Expired (in shares)	(237)
Balance at the end of the period (in shares)	4,884,958
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 13.50
Granted (in dollars per share)	$ 77.92
Exercised (in dollars per share)	$ 10.28
Forfeited (in dollars per share)	$ 31.11
Expired (in dollars per share)	$ 15.24
Balance at the end of the period (in dollars per share)	$ 32.64