Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Inventory Disclosure [Abstract]

Major classes of inventories

The following table summarizes the major classes of inventories as of December 31:

	2012		2011
Finished goods	$	183,286	$	188,571
Service parts	151,189		152,597
Raw materials and work in process	78,521		99,732
Total inventories	$	412,996	$	440,900