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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories consist of the following components (dollars in thousands):
 
 
June 30,
2019
 
December 31,
2018
Finished goods
 
$
90,960

 
$
91,780

Work in process
 
30,210

 
29,080

Raw materials
 
59,330

 
52,260

Total inventories
 
$
180,500

 
$
173,120