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STOCK PLANS (Summary of Stock Option Activity) (Details) - Stock options
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Stock Options, Shares  
Balance at beginning of year | shares 1,318,290
Options granted (in shares) | shares 222,589
Options exercised | shares (298,814)
Options canceled | shares (1,360)
Options forfeited | shares (60,944)
Balance at end of year | shares 1,179,761
Exercisable at end of year | shares 843,927
Stock Options, Weighted Average Exercise Price  
Balance at beginning of year, weighted average exercise price (in dollars per share) | $ / shares $ 71.25
Shares granted, weighted average exercise price (in dollars per share) | $ / shares 89.63
Shares exercised, weighted average exercise price (in dollars per share) | $ / shares 57.44
Shares canceled, weighted average exercise price (in dollars per share) | $ / shares 54.76
Shares forfeited, weighted average exercise price (in dollars per share) | $ / shares 89.35
Balance at end of year, weighted average exercise price (in dollars per share) | $ / shares 77.31
Exercisable at end of year, weighted average exercise price (in dollars per share) | $ / shares $ 72.50