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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories, net at December 31, 2016 and 2015 consist of the following:
 
2016
 
2015
 
(Dollars in thousands)
Raw materials
$
65,319

 
$
68,460

Work-in-process
54,555

 
57,079

Finished goods
196,297

 
204,736

Inventories, net
316,171

 
330,275