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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Revenue $ 147,758 $ 102,079
Printers And Other Products [Member]
   
Segment Reporting Information [Line Items]    
Revenue 60,753 39,723
Materials [Member]
   
Segment Reporting Information [Line Items]    
Revenue 40,441 28,729
Services [Member]
   
Segment Reporting Information [Line Items]    
Revenue $ 46,564 $ 33,627