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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories were as follows at the end of the periods noted below:
(Dollars in thousands)
June 30, 2017
 
December 31, 2016
Raw materials
$
39,163

 
$
29,788

Work-in-process
27,074

 
26,440

Finished goods
36,312

 
34,902

Total inventories
$
102,549

 
$
91,130