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Inventories (Schedule Of Major Components Of Inventories) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Inventory Disclosure [Abstract] |  |
Petroleum products | $ 6,881 | $ 14,235
Crude oil | 60,855 | 22,815
Caustic soda | 3,388 | 3,964
NaHS | 7,605 | 2,755
Other | 9 | 6
Total | $ 78,738 | $ 43,775

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