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Inventories
 3 Months Ended
Mar. 28, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories

The Corporation values its inventory at the lower of cost or net realizable value. Inventories included in the Condensed Consolidated Balance Sheets consisted of the following (in thousands):
 
March 28,
2020
 
December 28,
2019
 
Finished products
$
128,584

 
$
118,633

Materials and work in process
72,632

 
75,526

Last-in, first-out ("LIFO") allowance
(30,694
)
 
(30,694
)
Total inventories
$
170,522

 
$
163,465

 
 
 
 
 
 
 
 
Inventory valued by the LIFO costing method
72
%
 
65
%