Inventories (Tables)

3 Months Ended

Mar. 31, 2012

Inventory Disclosure [Abstract]

Major classes of inventories

Major classes of inventories are summarized as follows:

	March 31, 2012		December 31, 2011
Finished goods	$	217,108	$	188,571
Service parts	159,442		152,597
Raw materials and work in process	117,281		99,732
Total inventories	$	493,831	$	440,900