Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consisted of the following (in thousands):

	December 31,
	2011		2010
Raw materials and assembled parts	$	68,105	$	57,043
Service inventories, estimated current requirements	13,978		11,581
Work-in-process	66,275		55,279
Finished goods	33,652		32,061
Total current inventories	$	182,010	$	155,964
Non-current inventories	$	57,575	$	47,976