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Inventories | 6 Months Ended
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Jun. 30, 2019
Inventory Disclosure [Abstract] |
Inventories | Inventories
| June 30, 2019 |  | December 31, 2018
Raw materials | $ | 46,109 |  | $ | 55,002
Work in progress | 54,030 |  | 46,728
Finished goods | 45,333 |  | 39,368
Spares and other | 24,313 |  | 24,555
| 169,785 |  | 165,653
Reduction to LIFO cost basis | (31,551) |  | (28,471)
Total inventories – net | $ | 138,234 |  | $ | 137,182
Total inventories – net at June 30, 2019 were relatively flat compared to the balance at December 31, 2018. The shift in inventory categories reflects the normal course of operations including the timing of cumene deliveries and the fulfillment of customer orders.

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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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