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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventories [Abstract]  
Inventories
Inventories, which are stated at the lower of cost (determined by means of the first-in, first-out method) and net realizable value, consist of the following:

 
 
June 30,
2021
   
December 31,
2020
 
 
 
(In thousands)
 
Finished goods
 
$
261,627
   
$
225,523
 
Work in process
   
12,219
     
10,711
 
Raw materials
   
131,030
     
109,268
 
Subtotal
   
404,876
     
345,502
 
Unreturned customer inventories
   
22,070
     
19,632
 
Total inventories
 
$
426,946
   
$
365,134