Quarterly report pursuant to Section 13 or 15(d)

Inventories - Summary of Inventories (Details)

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Inventories - Summary of Inventories (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Finished Goods $ 31,951   $ 35,193
Work in Progress 39,319   33,219
Raw Material 83,600   81,784
Inventory, net $ 154,870 $ 142,239 $ 150,196