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Net Loss Per Share (Schedule Of Net Loss Per Share Reconciliation) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net loss attributable to 3D Systems Corporation $ (20,961) $ (9,971)
Weighted average shares 111,819 111,289
Net loss per share — basic and diluted (in dollars per share) $ (0.19) $ (0.09)