Computation Of Net Loss Per Share (Schedule Of Computation Of Net Loss Per Share Reconciliation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computation Of Net Loss Per Share [Abstract]
Net loss attributable to 3D Systems Corporation													$ (66,191)	$ (38,419)	$ (655,492)
Weighted average shares													111,554	111,189	111,969
Net loss per share — basic and diluted	$ (0.08)	$ (0.34)	$ (0.08)	$ (0.09)	$ 0.05	$ (0.19)	$ (0.04)	$ (0.16)	$ (5.32)	$ (0.29)	$ (0.12)	$ (0.12)	$ (0.59)	$ (0.35)	$ (5.85)
Shares excluded from diluted loss per share calculation													5,341	5,284	1,117