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Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 site | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts receivable, minimum | 90 days |  |
Number of geographic reporting units | 3 ddd_NumberOfGeographicReportingUnits |  |
Period to calculate the fair value of reporting units | 5 years |  |
Goodwill impairment | $ 0 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss
Software development costs capitalized | 0 us-gaap_CapitalizedComputerSoftwarePeriodIncreaseDecrease | 250 us-gaap_CapitalizedComputerSoftwarePeriodIncreaseDecrease | 0 us-gaap_CapitalizedComputerSoftwarePeriodIncreaseDecrease
Amortization of software development costs | 1,439 us-gaap_CapitalizedComputerSoftwareAmortization | 1,439 us-gaap_CapitalizedComputerSoftwareAmortization | 1,440 us-gaap_CapitalizedComputerSoftwareAmortization
Net capitalized software costs aggregated | 3,556 us-gaap_CapitalizedComputerSoftwareNet | 5,234 us-gaap_CapitalizedComputerSoftwareNet | 6,424 us-gaap_CapitalizedComputerSoftwareNet
Senior convertible notes, rate | 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |
Advertising expense | 8,799 us-gaap_AdvertisingExpense | 6,010 us-gaap_AdvertisingExpense | 3,972 us-gaap_AdvertisingExpense
International [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Revenue percentage | 49.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = ddd_ForeignMember |  |
Licenses And Patent Costs [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Licenses, patent and other long lived assets impairment | $ 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_LicensesAndPatentCostsMember | $ 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_LicensesAndPatentCostsMember | $ 0 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = ddd_LicensesAndPatentCostsMember
Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Sale payment period | 30 days |  |
Property and equipment, useful life, in years | 3 years |  |
Intangible assets, useful life | 1 year |  |
Minimum [Member] | Capitalized Software Costs [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful life | 1 year |  |
Minimum [Member] | Licenses And Patent Costs [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful life | 7 years |  |
Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Warranty agreement period | 1 year |  |
Sale payment period | 60 days |  |
Property and equipment, useful life, in years | 30 years |  |
Intangible assets, useful life | 20 years |  |
Maximum [Member] | Capitalized Software Costs [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful life | 8 years |  |
Maximum [Member] | Licenses And Patent Costs [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful life | 20 years |  |

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- Definition Period to calculate the fair value of reporting units + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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