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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 189,361 $ 178,805
Work in process 32,725 37,495
Finished goods 81,408 63,695
Total inventories $ 303,494 $ 279,995