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Goodwill and Long-lived Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Estimated future amortization expense of intangible assets    
2012 (remaining 3 months) $ 8,202  
2013 31,451  
2014 27,310  
2015 26,660  
2016 25,766  
Thereafter 41,019  
Net Carrying Amount $ 160,408 $ 181,955