Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consisted of the following (in thousands):

	March 31, 2013		December 31, 2012
Raw materials and assembled parts	$	67,922	$	67,985
Service inventories, estimated current requirements	15,543		15,898
Work-in-process	74,942		81,104
Finished goods	26,847		27,553
Total current inventories	$	185,254	$	192,540
Non-current inventories	$	63,564	$	65,116