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Accrued And Other Liabilities (Schedule Of Recognized Warranty Revenue And Incurred Warranty Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accrued And Other Liabilities [Abstract] |  |  |
Beginning Balance Deferred Warranty Revenue | $ 9,051 | $ 10,663 | $ 11,914
Warranty Revenue Deferred | 13,623 | 12,859 | 15,349
Warranty Revenue Recognized | (12,472) | (14,471) | (16,600)
Ending Balance Deferred Warranty Revenue | $ 10,202 | $ 9,051 | $ 10,663

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- Definition Deferred warranty revenue. + References No definition available. + Details
Name: | ddd_DeferredWarrantyRevenue
Namespace Prefix: | ddd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Warranty revenue deferred. + References No definition available. + Details
Name: | ddd_WarrantyRevenueDeferred
Namespace Prefix: | ddd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Warranty revenue recognized. + References No definition available. + Details
Name: | ddd_WarrantyRevenueRecognized
Namespace Prefix: | ddd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration