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Inventories
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are comprised of the following: 
 
As of
September 30, 2019
 
As of
December 31, 2018
 
(Dollars in thousands)
Inventories:
 
 
 
Raw materials
$
94,471

 
$
99,935

Work in process
143,192

 
125,767

Finished goods
77,292

 
68,015

         Total
$
314,955

 
$
293,717