EQUITY - ASSUMPTIONS USED TO DETERMINE COMPENSATION COST FOR THE COMPANY'S NON-QUALIFIED STOCK OPTIONS ISSUED (Details) - Nonqualified Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per share	$ 10.87	$ 9.41	$ 9.30
Expected dividend yield (in hundredths)	0.51%	0.59%	0.53%
Risk-free interest rate (in hundredths)	1.59%	1.61%	0.87%
Expected volatility (in hundredths)	20.30%	21.60%	24.70%
Expected life (years)	5 years 8 months 5 days	5 years 1 month 18 days	4 years 11 months 24 days