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Inventories
 3 Months Ended
Apr. 01, 2017
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.
 
(In thousands)
 
April 1, 2017
 
December 31, 2016
 
 
Finished products
 
$
88,034

 
$
71,223

Materials and work in process
 
79,839

 
71,375

LIFO allowance
 
(24,160
)
 
(24,160
)
 
 
$
143,713

 
$
118,438