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Acquisitions (Narrative) (Details) (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Acquisition of companies for cash consideration, total $ 0 $ 161,953
Camiant [Member]
    
Acquisition of companies for cash consideration, total   127,000
Blueslice [Member]
    
Acquisition of companies for cash consideration, total   $ 35,000