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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventory Disclosure [Abstract] |
Inventories | 5.Inventories Inventories consist of the following:
December 31, |  | 2020 |  |  | 2019 |
Inventory at FIFO |  |  |  |  |  |  |  |
Finished goods |  | $ | 2,878 |  |  | $ | 13,131 |
Materials and products in process |  |  | 77,609 |  |  |  | 65,880 |
Gross inventories |  |  | 80,487 |  |  |  | 79,011 |
Less: LIFO reserve |  |  | (48,016 | ) |  |  | (47,137 | )
Less: excess and obsolescence reserve |  |  | (3,394 | ) |  |  | (3,573 | )
Net Inventories |  | $ | 29,077 |  |  | $ | 28,301 |
In 2019 inventory quantities were reduced. This reduction resulted in a liquidation of LIFO inventory quantities carried at lower costs prevailing in prior years as compared with the current cost of purchases, the effect of which decreased 2019 costs of products sold by approximately $0.2 million.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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