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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Product) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenue $ 154,817 $ 135,717 $ 120,787 $ 102,079 $ 101,571 $ 90,532 $ 83,610 $ 77,920 $ 513,400 $ 353,633 $ 230,423
Printers And Other Products [Member]
                     
Segment Reporting Information [Line Items]                      
Revenue                 227,627 126,798 66,665
Materials [Member]
                     
Segment Reporting Information [Line Items]                      
Revenue                 128,405 103,182 70,641
Services [Member]
                     
Segment Reporting Information [Line Items]                      
Revenue                 $ 157,368 $ 123,653 $ 93,117