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International Retirement Plan (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Non-Contributory Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net present value of annuity | $ 2,981 ddd_NetPresentValueOfAnnuity / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_NonContributoryDefinedBenefitPensionPlanMember | $ 3,144 ddd_NetPresentValueOfAnnuity / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_NonContributoryDefinedBenefitPensionPlanMember
International Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized net gain (loss) of defined benefit plan before tax | (1,719)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember | (302)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember
Tax benefit on defined benefit loss | (515)ddd_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember | (78)ddd_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember
Adjustment to AOCI net gain (loss) of defined benefit plan after tax | 1,135 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember | 168 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember
Defined Benefit Plan, Amortization of Gains (Losses) | $ (69)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember | $ (56)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ddd_InternationalRetirementPlanMember

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- Definition Defined benefit plan accumulated other comprehensive income net gains losses, tax + References No definition available. + Details
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Period Type: | duration

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- Definition Net Present Value Of Annuity + References No definition available. + Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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