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Inventories
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
June 30,
2019
December 31,
2018
Raw materials$46,109 $55,002 
Work in progress54,030 46,728 
Finished goods45,333 39,368 
Spares and other24,313 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.