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International Retirement Plan (Components Of Net Periodic Benefit Costs And Other Amounts Recognized In Other Comprehensive Income) (Details) (International Retirement Plan [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
International Retirement Plan [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 47us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
$ 45us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
Interest cost 62us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
62us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
Total $ 109us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
$ 107us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember