Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventory Disclosure [Abstract]

Disclosure of inventories

Inventories consist of the following:

	March 31, 2012		December 31, 2011
Parts and work-in-process	$	31,813	$	35,444
Finished goods	48,012		44,298
	$	79,825	$	79,742