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Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Expected Amortization Expense [Line Items]  
2012 (remaining nine months) $ 1,971
2014 2,616
2015 2,610
2016 2,610
2017 2,610
Thereafter 13,012
Net Carrying Value as of March 31, 2013 $ 25,429