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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2013 | Dec. 31, 2011 | Dec. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options outstanding, number | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |  | 1,076 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Common stock available for future grants | 377 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | [1] | 1,445 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | [1] | 1,667 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant | [1] |  |  |
Number of stock options exercised | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 1,056 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |
Aggregate intrinsic value of stock option exercised |  |  |  |  | $ 39,165 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |
2004 Stock Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock available for future grants | 377 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  |  |  |  |  |  |  |
Payment for per share granted | 1.00 ddd_PaymentForPerShareGranted / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  |  |  |  |  |  |  |
Restricted Stock Awards [Member] | 2004 Stock Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense, Shares | 1,026 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  | 1,046 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  | 540 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  |  |  |
Share based compensation expense | 31,944 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  | 12,958 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  | 4,818 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  |  |  |
Estimated value associated with awards granted | 49,121 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  | 67,942 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  | 20,458 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  |  |  |
Percentage of fair market value of common stock at grant date | 10.00%ddd_PercentageOfFairMarketValueOfCommonStockAtGrantDate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember |  |  |  |  |  |  |  |
Non Employee Directors [Member] | 2004 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation expense, Shares | 17 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  | 12 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  | 11 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |  |  |
Share based compensation expense | 849 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  | 600 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  | 300 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |  |  |
Common stock available for future grants | 600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |  |  |  |  |  |  |
Limit on value of award shares to directors |  |  |  |  |  |  | $ 100 ddd_ShareBasedCompensationArrangementByShareBasedPaymentAwardPriceOfRights / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |
Non Employee Directors [Member] | Initial Grants [Member] | 2004 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued upon reaching milestones | 1 ddd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfGrantsIssuedUponReachingMilestones / us-gaap_AwardTypeAxis = ddd_InitialGrantMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |  |  |  |  |  |  |
Non Employee Directors [Member] | Annual Grants [Member] | 2004 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued upon reaching milestones | 3 ddd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfGrantsIssuedUponReachingMilestones / us-gaap_AwardTypeAxis = ddd_AnnualGrantMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |  |  |  |  |  |  |
Non Employee Directors [Member] | Interim Grants [Member] | 2004 Director Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock issued upon reaching milestones | 3 ddd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfGrantsIssuedUponReachingMilestones / us-gaap_AwardTypeAxis = ddd_InterimGrantsMember / us-gaap_PlanNameAxis = ddd_TwoThousandFourDirectorPlanMember / us-gaap_TitleOfIndividualAxis = ddd_NonEmployeeDirectorsMember |  |  |  |  |  |  |  |
Minimum [Member] | Restricted Stock Awards [Member] | 2004 Stock Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation award vesting period | 3 years |  |  |  |  |  |  |  |
Maximum [Member] | 2004 Stock Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance | 6,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  | 4,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = ddd_TwoThousandAndFourStockPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Restricted Stock Awards [Member] | 2004 Stock Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation award vesting period | 5 years |  |  |  |  |  |  |  |
[1] | Assumes the issuance of options permitted by the 2004 Incentive Stock Plan.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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