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Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Schedule of Goodwill  
Balance as of January 1, 2014 $ 757,368
Acquisition of Prolexic Technologies, Inc. 293,412
Balance as of March 31, 2014 $ 1,050,780