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Inventories
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
5. Inventories
The major components of inventories were as follows:
 
June 30,
2015
 
December 31,
2014
Petroleum products
$
28,043

 
$
30,108

Crude oil
20,636

 
7,266

Caustic soda
2,320

 
2,850

NaHS
3,567

 
6,603

Other

 
2

Total
$
54,566

 
$
46,829


Inventories are valued at the lower of cost or market. At June 30, 2015, market values of our inventories exceeded recorded costs. At December 31, 2014 , market value of inventories was below recorded costs by approximately $6.6 million, so we reduced the value of inventory as of that date in our Condensed Consolidated Financial Statements for this difference.