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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in thousands):
  
December 31,
 20202019
Raw materials$26,800 $27,285 
Work-in-process4,780 5,503 
Finished goods29,250 27,473 
$60,830 $60,261