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Inventories (Tables)
6 Months Ended
Jun. 29, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
The components of inventories at June 29, 2019 and December 29, 2018 are as follows:
 
(in thousands)
 
June 29, 2019
 
December 29, 2018
Raw materials
 
$
75,908

 
$
69,883

Work in process
 
93,523

 
88,505

Finished goods
 
84,874

 
99,840

Total
 
$
254,305


$
258,228