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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 166,944 $ 135,717 $ 466,214 $ 358,583
Printers And Other Products [Member]
       
Segment Reporting Information [Line Items]        
Revenue 72,917 59,841 195,618 153,754
Materials [Member]
       
Segment Reporting Information [Line Items]        
Revenue 39,009 33,179 117,486 91,183
Services [Member]
       
Segment Reporting Information [Line Items]        
Revenue $ 55,018 $ 42,697 $ 153,110 $ 113,646