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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories as of March 31, 2021 and December 31, 2020 were:
March 31,
2021
December 31,
2020
Raw materials and component parts$180,230 $173,248 
Work in process35,746 29,436 
Finished goods88,660 87,226 
Total inventories$304,636 $289,910