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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventories [Abstract]
Raw materials and parts	$ 138,821	$ 125,730
Work-in-process	80,696	71,490
Finished goods	80,655	80,157
Used equipment	21,914	21,688
Total	$ 322,086	$ 299,065

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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