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International Retirement Plan (Summary Of Amounts Recognized In Consolidated Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation $ 7,062us-gaap_DefinedBenefitPlanBenefitObligation $ 5,861us-gaap_DefinedBenefitPlanBenefitObligation  
International Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accrued liabilities 132us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
127us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
 
Other liabilities 7,062us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
5,860us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
 
Projected benefit obligation 7,194us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
5,987us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
5,240us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
Accumulated other comprehensive income (2,211)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
(1,076)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
 
Total $ 4,983us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember
$ 4,911us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ddd_InternationalRetirementPlanMember