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Inventories | 12 Months Ended
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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.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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