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Derivative Instruments (Derivative Instruments Outstanding) (Details) (Interest Rate Swaps [Member], USD $)
In Thousands, unless otherwise specified
Apr. 14, 2013
Sep. 30, 2012
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value $ (1,799) $ (2,433)
Accrued Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Total liabilities at fair value $ (1,799) $ (2,433)