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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of 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)
September 30,
2017
 
December 31, 2016
 
Finished products
$
96,275

 
$
71,223

Materials and work in process
81,970

 
71,375

LIFO allowance
(24,160
)
 
(24,160
)
 
$
154,085

 
$
118,438