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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories

5.  Inventories

The composition of inventories was as follows:

 

 

 

December 31

 

(In thousands)

 

2017

 

 

2016

 

Finished products

 

$

117,529

 

 

$

127,597

 

Raw materials

 

 

55,219

 

 

 

46,066

 

Total inventories

 

$

172,748

 

 

$

173,663

 

Inventories are primarily priced using the last-in, first-out (LIFO) inventory valuation method. If the first-in, first-out (FIFO) inventory valuation method had been used for all inventories, inventory balances would have been approximately $33,518,000 and $25,872,000 higher than reported at December 31, 2017 and 2016, respectively.