STOCK-BASED COMPENSATION – STOCK OPTIONS (Details) (Stock options, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock options
Weighted-average fair value
Weighted-average fair value per stock option granted (in dollars per share)		$ 6.70
Stock Options
Outstanding, at the beginning of the period (in shares)	134,017
Exercised (in shares)	(45,297)
Outstanding, at the end of the period (in shares)	88,720
Exercisable at the end of the period (in shares)	53,057
Weighted-Average Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)	$ 54.31
Exercised (in dollars per share)	$ 53.32
Outstanding at the end of the period (in dollars per share)	$ 54.81
Exercisable at the end of the period (in dollars per share)	$ 54.84
Weighted-Average Remaining Contractual Life (in Years)
Outstanding at the end of the period	6 years 7 months
Exercisable at the end of period	5 years 11 months
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 1.5
Exercisable at the end of the period (in dollars)	0.9
Additional disclosures
Granted (in shares)	0
Proceeds from stock option exercises	$ 2.7