Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Net Components of Inventory
Raw materials	$ 379,993	$ 351,705
Work in process	858,773	798,662
Finished goods	314,122	288,160
Less: Progress billings	(288,678)	(275,611)
Less: Excess and obsolete reserve	(80,022)	(76,253)
Inventories, net	$ 1,184,188	$ 1,086,663