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Inventories
3 Months Ended
Mar. 28, 2020
Inventory Disclosure [Abstract]  
Inventories
4. Inventories
Inventories consist of the following (in thousands):
 
March 28,
2020
 
December 28,
2019
Raw materials
$
53,902

 
$
55,913

Work-in-process
13,254

 
10,966

Finished goods
48,826

 
48,992

     Total inventories
$
115,982

 
$
115,871