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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories at December 31, 2019 and 2018 consist of the following:
 20192018
 (Dollars in thousands)
Raw materials
$114,302  $111,105  
Work-in-process71,479  62,334  
Finished goods290,776  254,339  
Inventories$476,557  $427,778