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Commitments And Contingencies (Narrative) (Details)
3 Months Ended 6 Months Ended
Aug. 03, 2018
USD ($)
Jun. 15, 2018
USD ($)
Mar. 30, 2018
USD ($)
Sep. 28, 2015
USD ($)
Aug. 23, 2013
lawsuit
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
lawsuit
Jun. 30, 2017
USD ($)
Feb. 15, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]                      
Rent expense under operating leases           $ 4,212,000 $ 3,698,000 $ 8,498,000 $ 7,452,000    
Total liabilities recorded for earnouts           2,135,000   2,135,000     $ 5,115,000
Redeemable noncontrolling interests           8,872,000   8,872,000     8,872,000
Estimate of possible loss                   $ 50,000,000  
Accrued litigation settlement           50,000,000   50,000,000     50,000,000
Insurance proceeds receivable           $ 50,000,000   $ 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   $ 349,000   $ 1,710,000              
Attorney fee   1,299,000                  
Non-taxable costs   $ 72,000                  
Barranco II vs. 3D Systems Corporation                      
Loss Contingencies [Line Items]                      
Damages awarded to 3D Systems     $ 522,900                
Subsequent Event                      
Loss Contingencies [Line Items]                      
Settlement paid $ 9,127,000