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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Estimated aggregate amortization expense  
2012 (remaining) $ 9,090
2013 15,843
2014 15,492
2015 13,972
2016 11,623
Thereafter 46,953
Total estimated future amortization expense $ 112,973