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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Components of Inventories
The components of inventories as of September 30, 2020 and December 31, 2019 were:
September 30,
2020
December 31,
2019
Raw materials and component parts$187,244 $182,382 
Work in process30,093 28,761 
Finished goods85,073 82,324 
Total inventories$302,410 $293,467