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Inventories (Tables)
 3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Net Components of Inventory
Inventories, net consisted of the following:
 
March 31,
 
  December 31,  
(Amounts in thousands)
2016
 
2015
Raw materials
$
415,403

 
$
390,998

Work in process
785,062

 
739,227

Finished goods
260,876

 
235,083

Less: Progress billings
(283,049
)
 
(285,582
)
Less: Excess and obsolete reserve
(90,137
)
 
(84,161
)
Inventories, net
$
1,088,155

 
$
995,565