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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Major classes of inventories
Finished goods	$ 188,571	$ 184,944
Service parts	152,597	166,317
Raw materials and work in process	99,732	93,314
Total inventories	$ 440,900	$ 444,575

The aggregate carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of items which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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