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Inventories, net (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories, net
Inventories as of June 30, 2019 and December 31, 2018 consisted of the following:
 
June 30, 2019
 
December 31, 2018
 
(Dollars in thousands)
Raw materials
$
131,252

 
$
111,105

Work-in-process
63,465

 
62,334

Finished goods
266,603

 
254,339

Inventories, net
$
461,320

 
$
427,778