STOCK-BASED PLANS (Details 2) (Restricted stock, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	1 Months Ended		3 Months Ended
	Mar. 31, 2014	Feb. 28, 2014 Total shareholder return through 2018 Key employees	Feb. 28, 2014 Vest on December 31, 2018 Key employees	Mar. 31, 2014 General and administrative expenses
Stock-based plans
Recognized compensation expense				$ 0.8
Unamortized restricted stock expense	$ 12.4
Weighted-average period for recognition of unamortized restricted stock expense	4 years 1 month 10 days
Restricted stock activity
Restricted stock outstanding at the beginning of the period (in shares)	122,332
Granted (in shares)	54,204
Restricted stock outstanding at the end of the period (in shares)	176,536
Weighted Average Grant Date Fair Value
Restricted stock outstanding at the beginning of the period (in dollars per share)	$ 75.21
Granted (in dollars per share)	$ 123.43
Restricted stock outstanding at the end of the period (in dollars per share)	$ 90.01
Percentage of awards vesting		50.00%	50.00%