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Long-Term Debt -Senior Secured Notes (Details) (Senior Secured Notes, due 2018 [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Senior Secured Notes, due 2018 [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, stated interest rate 8.00%  
Debt, short-term and long-term $ 500.0 $ 500.0