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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following:
 
December 31,
 
2017
 
2016
 
(In thousands)
Raw materials and purchased components
$
213,649

 
$
173,035

Work-in-process
112,843

 
94,955

   Total inventories
$
326,492

 
$
267,990