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STOCK-BASED COMPENSATION (Accounting for Stock-Based Compensation) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2016
$ / shares
Mar. 31, 2015
$ / shares
Mar. 31, 2014
$ / shares
Dec. 31, 2016
yr
mo
$ / shares
Dec. 31, 2015
yr
mo
$ / shares
Dec. 31, 2014
yr
mo
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Dividend yield       4.13% 3.54% 3.08%
Expected volatility       31.60% 27.84% 28.11%
Risk-free interest rate       1.12% 1.02% 1.11%
Dividends declared on common stock (Per share) $ 0.46 $ 0.42 $ 0.37 $ 1.84 $ 1.72 $ 1.53
Dividend Paid Per Share     $ 0.32      
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected life of award | yr       7.8 7.7 7.7
Employees' Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected life of award | mo       4 6 6