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Segment Information (Schedule Of Cash And Cash Equivalents By Geographic Area) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 284,862us-gaap_CashAndCashEquivalentsAtCarryingValue $ 306,316us-gaap_CashAndCashEquivalentsAtCarryingValue $ 155,859us-gaap_CashAndCashEquivalentsAtCarryingValue $ 179,120us-gaap_CashAndCashEquivalentsAtCarryingValue
Americas [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 245,219us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		 286,377us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		    
Germany [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 6,640us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_DE		 3,441us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_DE		    
Other EMEA [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents 15,556us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= ddd_OtherEuropeMember		 8,915us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= ddd_OtherEuropeMember		    
Asia Pacific [Member]        
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 17,447us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 $ 7,583us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember