Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventories [Abstract]

Schedule Of Inventories

	As of March 31, 2012			As of December 31, 2011
Raw materials	$	34,001		$	28,675
Finished goods		8,019			7,251
Sales demonstration inventory		17,352			16,794
Reserve for excess and obsolete		(3,030	)		(2,786	)
Inventory	$	56,342		$	49,934
Service inventory	$	18,477		$	17,316