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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Major classes of inventories
Finished goods	$ 197,429	$ 167,577
Service parts	125,570	132,508
Raw materials and work in process	82,174	76,377
Total inventories	$ 405,173us-gaap_InventoryNet	$ 376,462us-gaap_InventoryNet

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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