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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following components (dollars in thousands):
 
 
June 30,
2018
 
December 31,
2017
Finished goods
 
$
84,510

 
$
86,310

Work in process
 
26,840

 
24,580

Raw materials
 
49,330

 
44,460

Total inventories
 
$
160,680

 
$
155,350