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Income (Loss) Per Share (Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income (Loss) Per Share [Abstract]
Stock options, RSUs and shares held back in connection with the MakerBot transaction to purchase shares excluded from computation of diluted net income (loss) per share, ecause their inclusion would have had an anti-dilutive effect on the diluted net income (loss) per share	2.95	0.16

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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