STOCK PLANS (Summary of Stock Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock options
Stock Options, Shares
Balance at beginning of year	2,087,193	2,452,648	3,060,944
Options granted	323,130	5,121	273,105
Options exercised	(197,582)	(329,986)	(774,783)
Options canceled	(18,092)	(40,590)	(106,618)
Balance at end of year	2,194,649	2,087,193	2,452,648
Exercisable at end of year	1,807,427	1,818,218	1,837,014
Stock Options, Weighted Average Exercise Price
Balance at beginning of year, weighted average exercise price (in dollars per share)	$ 37.80	$ 36.52	$ 30.98
Shares granted, weighted average exercise price (in dollars per share)	69.14	69.61	70.88
Shares exercised, weighted average exercise price (in dollars per share)	30.35	27.63	26.20
Shares canceled, weighted average exercise price (in dollars per share)	66.51	47.21	40.54
Balance at end of year, weighted average exercise price (in dollars per share)	42.85	37.80	36.52
Exercisable at end of year, weighted average exercise price (in dollars per share)	$ 37.15	$ 33.89	$ 29.93
Equity and Incentive Compensation Plan [Member]
Stock Options, Shares
Options granted	16,970
Equity and Performance Incentive Plan [Member]
Stock Options, Shares
Options granted	306,160