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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 187,244 $ 182,382
Work in process 30,093 28,761
Finished goods 85,073 82,324
Total inventories $ 302,410 $ 293,467