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Goodwill and Intangibles Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Estimated amortization expense    
2012 (remaining six months) $ 2,884  
2013 5,754  
2014 5,705  
2015 4,797  
2016 4,462  
Thereafter 21,466  
Remaining amortization expense $ 45,068 $ 14,031