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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Inventories, net of reserves [Abstract]
Raw materials and parts	$ 125,730	$ 96,731
Work-in-process	71,490	60,463
Finished goods	80,157	77,583
Used equipment	21,688	18,204
Total	$ 299,065	$ 252,981

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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