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Inventories | 6 Months Ended
--- | ---
Jun. 30, 2023
Inventory Disclosure [Abstract] |
Inventories | Inventories
| June 30, 2023 |  | December 31, 2022
Raw materials | $ | 125,162 |  |  | $ | 126,060 |
Work in progress | 73,417 |  |  | 64,669 |
Finished goods | 92,824 |  |  | 60,711 |
Spares and other | 30,894 |  |  | 28,892 |
| 322,297 |  |  | 280,332 |
Reduction to LIFO cost basis | (96,311) |  |  | (64,830) |
Total inventories | $ | 225,986 |  |  | $ | 215,502 |
Substantially all of the Company’s inventories at June 30, 2023 and December 31, 2022 are valued at the lower of cost or market using the last-in, first-out (“LIFO”) method. However, approximately 7% was valued at average cost using the first-in, first-out (“FIFO”) method at June 30, 2023. The excess of replacement cost over the carrying value of total inventories subject to LIFO was $67.2 million and $58.2 million at June 30, 2023 and December 31, 2022, 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 -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//330/tableOfContent + Details
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