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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 188,848 $ 182,382
Work in process 38,803 28,761
Finished goods 97,280 82,324
Total inventories $ 324,931 $ 293,467