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STOCK-BASED COMPENSATION PLANS, Assumptions Used to Estimate Value of Stock Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
STOCK-BASED COMPENSATION PLANS [Abstract]      
Fair value assumptions, method used Black-Scholes model    
Weighted-average Fair Value of Options Granted (in dollars per share) $ 13.44 $ 12.78 $ 7.90
Assumptions [Abstract]      
Weighted-average expected life 6 years 6 months 6 years 6 months 6 years 6 months
Future dividend yield 2.91% 3.19% 3.43%
Share price volatility 29.44% 29.71% 30.00%
Weighted-average risk-free interest rate 2.82% 2.31% 1.72%