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Goodwill and Intangibles Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Estimated amortization expense    
2012 (remaining three months) $ 2,670  
2013 10,676  
2014 10,409  
2015 9,428  
2016 9,124  
Thereafter 38,017  
Remaining amortization expense $ 80,324 $ 14,031