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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 212,427 $ 173,248
Work in process 41,586 29,436
Finished goods 99,911 87,226
Total inventories $ 353,924 $ 289,910