Annual report pursuant to Section 13 and 15(d)

Inventories - Summary of Inventories (Details)

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Inventories - Summary of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Finished Goods $ 33,100   $ 35,193
Work in Progress 27,409   33,219
Raw Material 78,176   81,784
Total Inventory $ 138,685 $ 142,239 $ 150,196