Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details)

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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Goodwill and Other Intangible Assets [Abstract]  
Balance at December 31, 2012 $ 822,475
Acquisition of MakerBot 371,411
Effect of currency translation 1,135
Balance at September 30, 2013 $ 1,195,021