STOCK AWARD PLANS, Employee Plan Stock Option Activity (Details) - Employee Stock Award Plan [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Stock Award Plan Information [Abstract]
Shares available for future grants (in shares)	1,550,414
Stock Options [Member]
Stock Award Plan Information [Abstract]
Term of grant	7 years
Vesting period	3 years
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period Start (in shares)	654,655
Granted (in shares)	115,797
Exercised (in shares)	(94,465)
Outstanding at Period End (in shares)	675,987
Weighted Average Exercise Price [Abstract]
Outstanding at Period Start (in dollars per share) | $ / shares	$ 66.45
Granted (in dollars per share) | $ / shares	75.50
Exercised (in dollars per share) | $ / shares	52.79
Outstanding at Period End (in dollars per share) | $ / shares	$ 69.91
Stock Appreciation Rights [Member]
Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward]
Outstanding at Period End (in shares)	0