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Inventories
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are comprised of the following: 
 
As of December 31, 2014
 
As of
 June 30, 2015
 
(Dollars in thousands)
Inventories:
 
 
 
Raw materials and supplies
$
122,218

 
$
111,519

Work in process
176,141

 
168,396

Finished goods
84,544

 
95,718

         Total
$
382,903

 
$
375,633