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Inventories Inventories (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and parts $ 187,077 $ 154,647
Work-in-process 38,556 35,975
Finished goods 196,301 177,621
Inventory, Gross, Total $ 421,934 $ 368,243