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Inventories (Tables)
12 Months Ended
Dec. 28, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
The components of inventories at December 28, 2019 and December 29, 2018 are as follows:
 
(in thousands)
2019
 
2018
Raw materials
$
76,732

 
$
76,060

Work in process
84,561

 
97,645

Finished goods
110,388

 
117,207

Inventory reserves
(34,174
)
 
(32,684
)
Total
$
237,507


$
258,228