Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of Inventory
Raw materials	$ 390,998	$ 352,928
Work in process	739,227	687,343
Finished goods	235,083	265,439
Less: Progress billings	(285,582)	(230,058)
Less: Excess and obsolete reserve	(84,161)	(80,088)
Inventories, net	995,565	995,564
Expenses due to excess and obsolete inventory	$ 24,200	$ 19,200	$ 24,400

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-02.6(a))
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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Amount of advances received from customers under long-term contracts which have been offset against inventories accounts at the balance sheet date.

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