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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 90,532	$ 57,538	$ 252,062	$ 160,563
Printers And Other Products [Member]
Segment Reporting Information [Line Items]
Revenue	34,069	14,791	84,859	44,519
Materials [Member]
Segment Reporting Information [Line Items]
Revenue	25,482	18,457	76,364	50,483
Services [Member]
Segment Reporting Information [Line Items]
Revenue	$ 30,981	$ 24,290	$ 90,839	$ 65,561