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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
The following table sets forth the components of inventory:
(In thousands)
 
March 31, 2018
 
December 31, 2017
Finished products
 
$
75,192

 
$
66,064

Work in process
 
7,571

 
10,141

Raw materials and supplies
 
128,294

 
117,388

Inventories at current cost
 
211,057

 
193,593

Less: LIFO valuation
 
(39,854
)
 
(39,854
)
Total inventories
 
$
171,203

 
$
153,739