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STOCK PLANS (Summary of Stock Option Activity) (Details) - Stock options
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Stock Options, Shares  
Balance at beginning of year | shares 2,194,649
Options granted | shares 247,310
Options exercised | shares (820,972)
Options canceled | shares (11,285)
Balance at end of year | shares 1,609,702
Exercisable at end of year | shares 1,151,320
Stock Options, Weighted Average Exercise Price  
Balance at beginning of year, weighted average exercise price (in dollars per share) | $ / shares $ 42.85
Shares granted, weighted average exercise price (in dollars per share) | $ / shares 58.14
Shares exercised, weighted average exercise price (in dollars per share) | $ / shares 30.51
Shares canceled, weighted average exercise price (in dollars per share) | $ / shares 66.48
Balance at end of year, weighted average exercise price (in dollars per share) | $ / shares 51.32
Exercisable at end of year, weighted average exercise price (in dollars per share) | $ / shares $ 46.56