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Goodwill and Acquired Intangibles (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Estimated amortization expense    
2012-remaining period $ 13,186  
2013 23,099  
2014 20,315  
2015 20,001  
2016 19,562  
Thereafter 63,644  
Acquired Intangibles $ 159,807 $ 173,234