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Income Taxes (Schedule Of Effective Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Tax provision based on the federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Nondeductible expenses 12.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense    
Uncertain tax positions 11.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent    
Deemed income related to foreign operations 8.10%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Return to provision adjustments, foreign current and deferred balances 2.50%ddd_ReturnToProvisionAdjustmentsForeignCurrentAndDeferredBalances (0.40%)ddd_ReturnToProvisionAdjustmentsForeignCurrentAndDeferredBalances 0.50%ddd_ReturnToProvisionAdjustmentsForeignCurrentAndDeferredBalances
Foreign income tax rate differential 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
State taxes, net of federal benefit, before valuation allowance 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlementsStateAndLocal
Release of valuation allowances     (12.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Use of non-operating losses against U.S. taxable income, taxes     (14.60%)ddd_UseOfNonOperatingLossesAgainstUSTaxableIncomeTaxes
Foreign tax credits related to above (6.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign    
Domestic production activities deduction (12.00%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationForeignEarningsJobsCreationActOf2004 (3.60%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationForeignEarningsJobsCreationActOf2004  
Research credits (21.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch  
Other 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 31.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 31.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 10.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations