Inventories (Tables)

6 Months Ended

Jun. 30, 2011

Inventories (Tables) [Abstract]

Major classes of inventories

	June 30, 2011		December 31, 2010
Finished goods	$	204,648	$	184,944
Service parts		170,042		166,317
Raw materials and work in process		122,174		93,314
Total inventories	$	496,864	$	444,575