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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventories [Abstract]  
Details of Inventories

The following table presents the details of inventories (in thousands):

 
December 31,
 
   
2020
   
2019
 
Finished goods
 
$
255,491
   
$
291,214
 
Work in process
   
54,184
     
60,187
 
   
$
309,675
   
$
351,401