STOCK PLANS (Summary of Stock Option Activity) (Details) (Stock options, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options
Stock Options, Shares
Balance at beginning of year (in shares)	2,452,648	3,060,944	3,632,463
Granted (in shares)	5,121	273,105	412,980
Exercised (in shares)	(329,986)	(774,783)	(962,029)
Canceled (in shares)	(40,590)	(106,618)	(22,470)
Balance at end of year (in shares)	2,087,193	2,452,648	3,060,944
Exercisable at end of year (in shares)	1,818,218	1,837,014	2,208,455
Stock Options, Weighted Average Exercise Price
Balance at beginning of year, weighted average exercise price (in dollars per share)	$ 36.52	$ 30.98	$ 26.05
Shares granted, weighted average exercise price (in dollars per share)	$ 69.61	$ 70.88	$ 47.66
Shares exercised, weighted average exercise price (in dollars per share)	$ 27.63	$ 26.20	$ 19.52
Shares canceled, weighted average exercise price (in dollars per share)	$ 47.21	$ 40.54	$ 24.07
Balance at end of year, weighted average exercise price (in dollars per share)	$ 37.80	$ 36.52	$ 30.98
Exercisable at end of year, weighted average exercise price (in dollars per share)	$ 33.89	$ 29.93	$ 27.19