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Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Expected Amortization Expense [Line Items]  
2012 (remaining three months) $ 1,134
2014 4,537
2015 4,493
2016 4,470
Finite-Lived Intangible Assets, Amortization Expense, Year Five 4,470
Thereafter 27,713
Net Carrying Value as of September 30, 2012 $ 46,817