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Inventories | 12 Months Ended
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Dec. 31, 2022
Inventory Disclosure [Abstract] |
Inventories | Inventories The major components of inventories were as follows:
| December 31,
| 2022 |  | 2021
Petroleum products | $ | 56 |  |  | $ | 998 |
Crude oil | 6,673 |  |  | 11,834 |
Caustic soda | 15,258 |  |  | 5,690 |
NaHS | 7,085 |  |  | 17,040 |
Raw materials - Alkali Operations | 5,819 |  |  | 7,599 |
Work-in-process - Alkali Operations | 9,599 |  |  | 7,496 |
Finished goods, net - Alkali Operations | 18,772 |  |  | 13,681 |
Materials and supplies, net - Alkali Operations | 14,881 |  |  | 13,620 |
Total | $ | 78,143 |  |  | $ | 77,958 |
Inventories are valued at the lower of cost or net realizable value. The net realizable value of inventories were below cost by $2.9 million as of December 31, 2022, which triggered a reduction of the value of inventory in our Consolidated Financial Statements by this amount. We recorded $2.0 million in inventory reduction adjustments as of December 31, 2021. Materials and supplies include chemicals, maintenance supplies, and spare parts which will be consumed in the mining of trona ore and production of soda ash processes.

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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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