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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 199,896us-gaap_CashAndCashEquivalentsAtCarryingValue $ 284,862us-gaap_CashAndCashEquivalentsAtCarryingValue $ 306,704us-gaap_CashAndCashEquivalentsAtCarryingValue $ 306,316us-gaap_CashAndCashEquivalentsAtCarryingValue
Americas [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 149,629us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
245,219us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
   
Germany [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 13,419us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_DE
6,640us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_DE
   
Other EMEA [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 22,231us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= ddd_OtherEuropeMember
15,556us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= ddd_OtherEuropeMember
   
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 14,617us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
$ 17,447us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember