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Inventories
 6 Months Ended
Jul. 01, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories

The Corporation values its inventory at the lower of cost or net realizable value with approximately 85 percent valued by the last-in, first-out ("LIFO") costing method.
 
(In thousands)
July 1,
2017
 
December 31, 2016
 
Finished products
$
107,874

 
$
71,223

Materials and work in process
83,491

 
71,375

LIFO allowance
(24,160
)
 
(24,160
)
 
$
167,205

 
$
118,438