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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials and component parts $ 187,299 $ 178,805
Work in process 44,780 37,495
Finished goods 66,248 63,695
Total inventories $ 298,327 $ 279,995