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Inventories | 12 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Inventories | 4.Inventories Inventories consist of the following:
December 31, |  | 2019 |  | 2018 |
Inventory at FIFO |  |  |  |  |  |  |  |
Finished goods |  | $ | 13,131 |  |  | $ | 17,313 |
Materials and products in process |  |  | 65,880 |  |  |  | 62,975 |
Gross inventories |  |  | 79,011 |  |  |  | 80,288 |
Less: LIFO reserve |  |  | (47,137 | ) |  |  | (46,341 | )
Less: excess and obsolescence reserve |  |  | (3,573 | ) |  |  | (2,527 | )
Net Inventories |  | $ | 28,301 |  |  | $ | 31,420 |
62 Table of Contents In 2019 and 2018, inventory quantities were reduced. These reductions resulted in liquidations 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 and 2018 costs of products sold by approximately $0.2 million and $0.6 million, 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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