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Condensed Financial Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Organization Consolidation And Presentation Of Financial Statements [Abstract]      
Revenue Recognized Under Net Reporting Arrangements   $ 30,878 $ 37,787
Provision for Doubtful Accounts $ 1,156