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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
The components of inventories at December 31 were as follows:
 
20202019
 (Dollars in thousands)
Raw materials$270,066 $286,953 
Work-in-process167,100 134,417 
Finished goods335,346 355,337 
Other14,610 12,793 
787,122 789,500 
Adjustment to value inventory at cost on the LIFO method(109,588)(156,495)
$677,534 $633,005