Net Loss Per Share (Schedule Of Net Loss Per Share Reconciliation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator for basic and diluted net loss per share:
Net loss attributable to 3D Systems Corporation	$ (19,830)	$ (72,889)	$ (37,951)	$ (18,924)	$ (4,714)	$ (16,843)	$ (23,929)	$ (24,394)	$ (4,136)	$ (11,550)	$ (8,862)	$ (20,957)	$ (149,594)	$ (69,880)	$ (45,505)
Denominator for basic and diluted net loss per share:
Weighted average shares (in shares)													117,579	113,811	112,327
Net loss per share — basic and diluted (in dollars per share)	$ (0.16)	$ (0.61)	$ (0.33)	$ (0.17)	$ (0.04)	$ (0.15)	$ (0.21)	$ (0.22)	$ (0.04)	$ (0.10)	$ (0.08)	$ (0.19)	$ (1.27)	$ (0.61)	$ (0.41)