Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Inventory Disclosure [Abstract]

Disclosure of inventories

Inventories consist of the following:

	As of December 31,
	2012		2011
Parts and work-in-process	$	27,355	$	35,444
Finished goods	43,900		44,298
Inventory	$	71,255	$	79,742