STOCK PLANS (Summary of Stock Option Activity) (Details) - Stock options	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Stock Options, Shares
Balance at beginning of year | shares	1,431,038
Options granted | shares	201,881
Options exercised | shares	(314,629)
Balance at end of year | shares	1,318,290
Exercisable at end of year | shares	943,715
Stock Options, Weighted Average Exercise Price
Balance at beginning of year, weighted average exercise price (in dollars per share) | $ / shares	$ 63.19
Shares granted, weighted average exercise price (in dollars per share) | $ / shares	88.44
Shares exercised, weighted average exercise price (in dollars per share) | $ / shares	45.60
Balance at end of year, weighted average exercise price (in dollars per share) | $ / shares	71.25
Exercisable at end of year, weighted average exercise price (in dollars per share) | $ / shares	$ 64.34