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Inventories (Tables)
6 Months Ended
Jun. 29, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories are comprised of the following (in thousands):
 
June 29,
2018
 
December 29,
2017
Raw materials
$
85,767

 
$
85,050

Work-in-process
76,761

 
63,620

Finished goods
32,449

 
28,068

Total
$
194,977

 
$
176,738