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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
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,
2019
  
December 31,
2018
 
  
(In thousands)
 
       
Finished goods
 
$
239,889
  
$
226,802
 
Work in process
  
9,174
   
10,527
 
Raw materials
  
116,188
   
112,482
 
Subtotal
  
365,251
   
349,811
 
Unreturned customer inventories
  
19,784
   
20,484
 
Total inventories
 
$
385,035
  
$
370,295