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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories

December 31,

 

2019

 

 

2018

 

(Dollars in thousands)

 

 

 

 

 

 

 

 

Raw materials

 

$

44,245

 

 

$

49,571

 

Work in process

 

 

40,344

 

 

 

42,886

 

Finished goods

 

 

83,881

 

 

 

83,121

 

Inventories, net

 

$

168,470

 

 

$

175,578