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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Net Components of Inventory
Inventories
Inventories, net consisted of the following:
 
September 30,
 
  December 31,  
(Amounts in thousands)
2017
 
2016
Raw materials
$
374,154

 
$
348,012

Work in process
682,522

 
629,766

Finished goods
208,465

 
206,086

Less: Progress billings
(233,040
)
 
(216,783
)
Less: Excess and obsolete reserve
(80,503
)
 
(69,391
)
Inventories, net
$
951,598

 
$
897,690