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STOCK-BASED COMPENSATION PLANS, Activity in Long-Term Incentive Program (Details) - Stock Options [Member] - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Options, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares) 1,755,992 1,969,301
Granted (in shares) 197,943 330,383
Exercised (in shares) (238,499) (525,298)
Forfeited (in shares) (7,140) (18,394)
Outstanding, end of period (in shares) 1,708,296 1,755,992
Exercisable, end of period (in shares) 1,015,823  
Weighted-average exercise price of shares [Abstract]    
Outstanding, beginning of period (in dollars per share) $ 30.85 $ 28.15
Granted (in dollars per share) 57.02 38.02
Exercised (in dollars per share) 25.72 25.12
Forfeited (in dollars per share) 37.47 34.47
Outstanding, end of period (in dollars per share) 34.57 $ 30.85
Exercisable, end of period (in dollars per share) $ 29.57