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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 180,230 $ 173,248
Work in process 35,746 29,436
Finished goods 88,660 87,226
Total inventories $ 304,636 $ 289,910