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Inventory, net (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Composition of Inventory net of reserves
Parts and supplies	$ 271,256,000	$ 269,370,000
Work in progress	108,939,000	100,499,000
Finished goods	37,620,000	33,702,000
Inventory, net	417,815,000us-gaap_InventoryNet	403,571,000us-gaap_InventoryNet
Inventory reserves	$ 20,400,000us-gaap_InventoryValuationReserves	$ 20,200,000us-gaap_InventoryValuationReserves

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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