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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventories [Abstract]  
Inventories
 
 
December 31,
2020
   
December 31,
2019
 
 
 
(In thousands)
 
 
           
Finished goods
 
$
225,523
   
$
241,472
 
Work-in-process
   
10,711
     
11,138
 
Raw materials
   
109,268
     
115,611
 
Subtotal
   
345,502
     
368,221
 
Unreturned customer inventories
   
19,632
     
19,722
 
Total inventories
 
$
365,134
   
$
387,943