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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventories
(In thousands)
 
June 30, 2015
 
December 31, 2014
Finished products
 
$
75,832

 
$
67,713

Work in process
 
8,161

 
8,942

Raw materials and supplies
 
66,422

 
46,299

Total inventories
 
150,415

 
122,954

Excess of FIFO costs over LIFO costs
 
44,468

 
44,468

Total FIFO inventories
 
$
194,883

 
$
167,422