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Inventories
 9 Months Ended
Sep. 29, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories

The Corporation values its inventory at the lower of cost or net realizable value with approximately 83 percent valued by the last-in, first-out ("LIFO") costing method. Inventories included in the Condensed Consolidated Balance Sheets consisted of the following (in thousands):
 
September 29,
2018
 
December 30,
2017
 
Finished products
$
106,349

 
$
101,715

Materials and work in process
95,584

 
81,202

LIFO allowance
(27,382
)
 
(27,234
)
Total inventories
$
174,551

 
$
155,683