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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Major classes of inventories
Finished goods	$ 202,158	$ 183,286
Service parts	150,814	151,189
Raw materials and work in process	78,200	78,521
Total inventories	$ 431,172	$ 412,996

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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