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Inventories (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Inventory, Net [Abstract]
Raw materials and work in process	$ 54,395	$ 46,664
Supplies and service parts	61,238	63,991
Finished products	61,871	58,312
Total	$ 177,504	$ 168,967

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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