SERIES A 3.00% REDEEMABLE CONVERTIBLE PREFERRED STOCK (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 01, 2009 Series A 3% Redeemable Convertible Preferred Stock	Dec. 31, 2013 Series A 3% Redeemable Convertible Preferred Stock	Dec. 31, 2012 Series A 3% Redeemable Convertible Preferred Stock	Dec. 31, 2011 Series A 3% Redeemable Convertible Preferred Stock	Feb. 11, 2014 Subsequent Event Series A 3% Redeemable Convertible Preferred Stock
Mezzanine Equity
Preferred stock issued (in shares)	75,000	75,000		75,000
Interest rate (as a percent)	3.00%	3.00%	3.00%	3.00%	3.00%
Preferred stock , par value (in dollars per share)	$ 0.001	$ 0.001		$ 0.001
Aggregate purchase price				$ 75.0
Accrued dividends on Series A Preferred Stock					10.4	7.9	5.5
Direct issuance costs				5.6
Period over which issuance expenses will be accreted				5 years
Accretion charges					1.2	1.1	1.0
Closing value of common stock on issuance date (in dollars per share)				$ 17.45
Intrinsic value per conversion share (in dollars per share)				$ 4.65
Preferred stock conversion price after Make-Whole adjustment (in dollars per share)				$ 12.92
Proceeds utilized to pay expenses of the investor				0.7
Beneficial conversion feature on sale				$ 27.0
Conversion rate of shares per 1000$ of Liquidation preference (in shares per dollar)					66.667
Conversion price (in dollars per share)					$ 15.00
Minimum number of days of prior notice for automatic conversion					10 days
Minimum closing market price of common stock to trigger automatic conversion (in dollars per share)					$ 35.00
Number of consecutive trading days for which the closing sales price must equal or exceed $35.00 per share to trigger automatic conversion					20 days
Maximum number of shares of common stock upon conversion								5,805,921