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STOCKHOLDERS' EQUITY AND EQUITY INSTRUMENTS (Summary of Fair Value Assumptions and Methodology) (Details) - Stock options - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of options granted (in dollars per share) $ 8.77 $ 9.54 $ 10.17
Expected term (years) 4 years 6 months 4 years 6 months 4 years 6 months
Expected volatility 22.90% 23.20% 24.40%
Dividend yield 3.60% 3.50% 3.30%
Risk-free interest rates 2.50% 1.80% 1.20%