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Commitments And Contingencies (Narrative) (Details)				3 Months Ended
Commitments And Contingencies (Narrative) (Details)	Mar. 30, 2018 USD ($)	Sep. 28, 2015 USD ($)	Aug. 23, 2013 lawsuit	Mar. 31, 2018 USD ($) lawsuit	Mar. 31, 2017 USD ($)	Feb. 15, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Rent expense under operating leases				$ 4,267,000	$ 3,682,000
Total liabilities recorded for earnouts				2,556,000			$ 5,115,000
Redeemable noncontrolling interests				8,872,000			8,872,000
Estimate of possible loss						$ 50,000,000
Accrued litigation settlement				50,000,000			50,000,000
Insurance proceeds receivable				$ 50,000,000			$ 50,000,000
Number of stockholder class action lawsuits \| lawsuit			2	9
Provision for arbitration award		$ 11,282,000
Alleged actual damages		7,254,000
Fees and expenses		2,318,000
Prejudgment interest		$ 1,710,000
Barranco II vs. 3D Systems Corporation
Loss Contingencies [Line Items]
Damages awarded to 3D Systems	$ 522,900