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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Revenue $ 151,512 $ 120,787 $ 299,270 $ 222,866
Printers And Other Products [Member]
       
Segment Reporting Information [Line Items]        
Revenue 61,948 54,190 122,701 93,913
Materials [Member]
       
Segment Reporting Information [Line Items]        
Revenue 38,036 29,275 78,477 58,004
Services [Member]
       
Segment Reporting Information [Line Items]        
Revenue $ 51,528 $ 37,322 $ 98,092 $ 70,949