Inventories (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Inventories [Abstract]
Raw materials	$ 28,675	$ 12,743
Finished goods	7,251	3,441
Sales demonstration inventory	16,794	14,662
Reserve for excess and obsolete	(2,786)	(2,604)
Inventory	49,934	28,242
Service inventory	$ 17,316	$ 13,726