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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net loss attributable to 3D Systems Corporation $ (8,862) $ (8,416) $ (29,819) $ (18,387)
Weighted average shares 111,920 111,398 111,870 111,350
Net loss per share — basic and diluted (in dollars per share) $ (0.08) $ (0.08) $ (0.27) $ (0.17)