SHARE-BASED COMPENSATION - Stock Options Activity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at the beginning of year	660,333		714,866	780,981
Granted (in shares)	85,930		116,119	210,000
Exercised (in shares)	(74,430)		(143,652)	(28,928)
Forfeited (in shares)	(41,153)		(27,000)	(244,937)
Canceled (in shares)				(2,250)
Options outstanding at the end of year	630,680		660,333	714,866
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price at the beginning of year	$ 25.60		$ 20.89	$ 18.10
Granted (in dollars per share)	$ 72.42		$ 42.69	$ 26.82
Exercised (in dollars per share)	$ 20.62		$ 17.50	$ 17.50
Forfeited (in dollars per share)	$ 29.61		$ 17.50	$ 17.50
Canceled (in dollars per share)				$ 17.50
Weighted Average Exercise Price at the end of year	$ 32.31		$ 25.60	$ 20.89
Weighted Average Remaining Contractual Term (in years)	7 years 6 months
Aggregate Intrinsic Value (in millions)	$ 3.7		$ 6.4	$ 0.7
Options vested and exercisable as of December 31, 2013	275,011
Options vested and exercisable as of December 31, 2013, Weighted Average Exercise Price	$ 24.93
Options vested and exercisable as of December 31, 2013, Weighted Average Remaining Contractual Term	7 years 1 month 6 days
Options vested and exercisable as of December 31, 2013, Aggregate Intrinsic Value	13.7	[1]
Remaining options expected to vest as of December 31, 2013	332,718
Remaining options expected to vest as of December 31, 2013, Weighted Average Exercise Price	$ 37.98
Remaining options expected to vest as of December 31, 2013, Weighted Average Remaining Contractual Term	8 years 1 month 6 days
Remaining options expected to vest as of December 31, 2013, Aggregate Intrinsic Value	$ 12.2	[1]

[1] The aggregate intrinsic value of options represents the total pre-tax intrinsic value (the difference between the estimated fair value of the Company's stock on December 31, 2013 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31, 2013. This amount changes based upon the fair market value of the Company's common stock.