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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Major classes of inventories
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

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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