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Acquired Intangible Assets (Calculation Of Estimated Future Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Acquired Intangible Assets [Abstract]  
2012 (six months ending June 30) $ 69,376
2013 135,571
2014 76,990
2015 53,203
2016 and beyond 46,782
Total $ 381,922