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Detail of Certain Balance Sheet Accounts - AR (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Allowance For Doubtful Accounts Receivable [Abstract]      
Allowance for Doubtful Accounts Receivable Beginning Balance $ 2,704 $ 7,429 $ 2,704
Additions to costs and expenses 771 1,071  
Allowance For Doubtful Accounts Receivable Charge Offs (1,687) (5,796)  
Allowance for Doubtful Accounts Receivable Ending Balance $ 1,788 $ 2,704 $ 2,704