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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Summary of Inventories

December 31,

    2017      2016  
(Dollars in thousands)              

Raw materials

    $ 59,353      $ 40,255  

Work in process

      48,803        21,447  

Finished goods

      65,843        21,135  
  

 

 

     

 

 

  

Inventories

    $ 173,999      $ 82,837