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Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 134,611us-gaap_PropertyPlantAndEquipmentGross $ 87,685us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation and amortization (52,730)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (42,477)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property and equipment, net 81,881us-gaap_PropertyPlantAndEquipmentNet 45,208us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 541us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 541us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 9,370us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 9,315us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Property and equipment, useful life, in years 25 years  
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 84,443us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember		 56,962us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
Capitalized Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 3,693us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 3,872us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Office Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 3,478us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ddd_OfficeFurnitureAndEquipmentMember		 3,586us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ddd_OfficeFurnitureAndEquipmentMember
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 12,447us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 9,395us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold improvements useful life Life of lease (a) [1]  
Rental Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 557us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ddd_RentalEquipmentMember		  
Property and equipment, useful life, in years 5 years  
Construction In Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 20,082us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 $ 4,014us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 3 years  
Minimum [Member] | Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 3 years  
Minimum [Member] | Capitalized Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 3 years  
Minimum [Member] | Office Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 3 years  
Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 30 years  
Maximum [Member] | Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 7 years  
Maximum [Member] | Capitalized Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 5 years  
Maximum [Member] | Office Furniture And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life, in years 5 years  
[1] Leasehold improvements are amortized on a straight-line basis over the shorter of (i) their estimated useful lives and (ii) the estimated or contractual life of the related lease.