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Inventories
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following components (dollars in thousands):
 
 
December 31,
2016
 
December 31,
2015
Finished goods
 
$
95,290

 
$
101,480

Work in process
 
22,930

 
23,620

Raw materials
 
42,240

 
42,270

Total inventories
 
$
160,460

 
$
167,370