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Inventories | 9 Months Ended
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Sep. 30, 2020
Inventory Disclosure [Abstract] |
Inventories | Inventories The major components of inventories were as follows:
| September 30, 2020 |  | December 31, 2019
Petroleum products | $ | 1,868 |  |  | $ | 2,721 |
Crude oil | 29,012 |  |  | 5,271 |
Caustic soda | 5,510 |  |  | 5,965 |
NaHS | 10,056 |  |  | 10,845 |
Raw materials - Alkali operations | 7,194 |  |  | 6,238 |
Work-in-process - Alkali operations | 8,565 |  |  | 8,579 |
Finished goods, net - Alkali operations | 15,086 |  |  | 14,168 |
Materials and supplies, net - Alkali operations | 12,520 |  |  | 11,350 |
Total | $ | 89,811 |  |  | $ | 65,137 |
Inventories are valued at the lower of cost or net realizable value. The net realizable value of inventories was adjusted $4.1 million below cost as of September 30, 2020, with no such adjustment as of December 31, 2019.

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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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