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Inventories | 9 Months Ended
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Sep. 30, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories
| September 30, 2018 |  | December 31, 2017
Raw materials | $ | 34,334 |  | $ | 48,502
Work in progress | 56,049 |  | 50,511
Finished goods | 29,063 |  | 35,430
Spares and other | 24,052 |  | 23,091
| 143,498 |  | 157,534
Reduction to LIFO cost basis | (28,472) |  | (28,326)
Total inventories – net | $ | 115,026 |  | $ | 129,208
The decrease in Total inventories – net as of September 30, 2018 compared to December 31, 2017 is due to lower levels of raw materials driven by the timing of cumene deliveries.

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