STOCK-BASED COMPENSATION – PERFORMANCE STOCK RIGHTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Performance Stock Rights
Assumptions incorporated into the valuation models
Risk-free interest rate, minimum (as a percent)	0.34%
Risk-free interest rate, maximum (as a percent)	0.57%
Expected volatility, minimum (as a percent)	15.00%
Expected volatility, maximum (as a percent)	22.00%
Additional Disclosures
Shares distributed	0
Performance Stock Rights | Minimum
Assumptions incorporated into the valuation models
Period of historical volatility used to estimate expected volatility	2 years
Expected dividend yield (as a percent)	5.28%
Performance Stock Rights | Maximum
Assumptions incorporated into the valuation models
Period of historical volatility used to estimate expected volatility	3 years
Expected dividend yield (as a percent)	5.33%
Performance Stock Rights Accounted for as Equity Awards
Performance Stock Rights
Outstanding at the beginning of the period (in shares)	5,561
Granted (in shares)	1,113
Adjustment for shares not distributed	(3,347)
Outstanding at the end of the period (in shares)	3,327
Weighted-Average Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 45.16
Granted (in dollars per share)	$ 44.28	$ 48.50
Adjustment for shares not distributed (in dollars per share)	$ 41.90
Outstanding at the end of the period (in dollars per share)	$ 48.15
Performance Stock Rights Accounted for as Liability Awards
Performance Stock Rights
Outstanding at the beginning of the period (in shares)	9,222
Granted (in shares)	4,440
Adjustment for shares not distributed	(379)
Outstanding at the end of the period (in shares)	13,283
Weighted-Average Fair Value
Outstanding at the end of the period, fair value as of the reporting date (in dollars per shares)	$ 38.39