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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventories [Abstract]  
Inventory Stated at Cost, Net of Reserve
Inventory stated at cost, net of reserve, consisted of the following:

   
September 30,
2021
   
December 31,
2020
 
Materials
 
$
85,655
     
61,270
 
Work in progress
   
39,879
     
49,650
 
Finished goods
   
24,802
     
20,458
 
Inventory, net
 
$
150,336
     
131,378