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Inventories Inventories (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and parts $ 161,662 $ 154,647
Work-in-process 40,524 35,975
Finished goods 194,008 177,621
Inventory, Gross, Total $ 396,194 $ 368,243