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Derivative Instruments (Derivative Instruments Outstanding) (Details) (Interest Rate Swaps [Member], USD $) In Thousands, unless otherwise specified	Jan. 20, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	$ (2,015)	$ (2,433)
Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	$ (2,015)	$ (2,433)

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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