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Derivatives - Hedged Items (Details) (Term Loan [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Sep. 30, 2011
Term Loan [Member]
   
Debt Instrument [Line Items]    
Term Loan Principal Amount   $ 75.0
Term Loan Variable Rate Basis one-month LIBOR  
Term Loan Basis Spread on Variable Rate 1.00%