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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 204,491 $ 182,382
Work in process 42,021 28,761
Finished goods 94,069 82,324
Total inventories $ 340,581 $ 293,467