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Inventory, net (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Composition of Inventory net of reserves
Parts and supplies	$ 240,234,000	$ 233,216,000
Work in progress	140,545,000	139,763,000
Finished goods	40,534,000	40,948,000
Inventory, net	421,313,000	413,927,000
Inventory reserves	$ 17,600,000	$ 14,100,000

Amount of valuation reserve for inventory.

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- Definition

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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