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Segment Information (Schedule Of Assets By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Assets $ 1,513,427us-gaap_Assets $ 1,525,970us-gaap_Assets
Americas [Member]    
Segment Reporting Information [Line Items]    
Assets 920,092us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
1,018,113us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Germany [Member]    
Segment Reporting Information [Line Items]    
Assets 53,448us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_DE
47,524us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_DE
Other EMEA [Member]    
Segment Reporting Information [Line Items]    
Assets 467,263us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= ddd_OtherEuropeMember
382,259us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= ddd_OtherEuropeMember
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Assets $ 72,624us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
$ 78,074us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember