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International Retirement Plan (Summary Of Estimated Future Benefit Payments) (Details) (International Retirement Plan [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
International Retirement Plan [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
2015 $ 135us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
2016 152us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
2017 155us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
2018 158us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
2019 175us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
2020 - 2024 $ 1,142us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember