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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
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:

 
 
March 31,
2020
   
December 31,
2019
 
 
 
(In thousands)
 
Finished goods
 
$
242,978
   
$
241,472
 
Work in process
   
12,548
     
11,138
 
Raw materials
   
115,409
     
115,611
 
Subtotal
   
370,935
     
368,221
 
Unreturned customer inventories
   
19,379
     
19,722
 
Total inventories
 
$
390,314
   
$
387,943