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Goodwill and Intangible Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summary of changes in goodwill    
Goodwill, Beginning balance $ 466,892 $ 460,610
Additions 3,043 6,390
Foreign exchange translation adjustment 1,749 (108)
Goodwill, Ending balance $ 471,684 $ 466,892