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Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Expected Amortization Expense [Line Items]  
Remainder of 2013 $ 1,325
2014 2,635
2015 2,629
2016 2,629
2017 2,629
Thereafter 13,129
Net Carrying Value, ending balance $ 24,976