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Stock-Based Compensation Plans (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
2004 Incentive Stock Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock awards granted | 273,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember | 233,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember
2004 Restricted Stock Plan For Non Employee Directors [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock awards granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = ddd_TwoThousandFourRestrictedStockPlanForNonEmployeeDirectorsMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = ddd_TwoThousandFourRestrictedStockPlanForNonEmployeeDirectorsMember
Restricted Stock Awards [Member] | 2004 Incentive Stock Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock awards granted | 273,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember | 233,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember
Restricted stock awards remaining to grant | 148,000 ddd_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingSharesToGrant / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember |
Executive Officer [Member] | Restricted Stock Awards [Member] | 2004 Incentive Stock Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock awards granted | 60,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember | 30,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourIncentiveStockPlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember

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- Definition Share based compensation arrangement by share based payment award remaining shares to grant + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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