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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories consisted of the following:
(Dollars in thousands)
June 30, 2019
 
December 31, 2018
Raw materials
$
63,931

 
$
59,321

Work-in-process
31,646

 
30,086

Finished goods
39,490

 
43,230

Total inventories
$
135,067

 
$
132,637