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Inventories (Schedule Of Major Components Of Inventories) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Inventory Disclosure [Abstract] |  |
Petroleum products | $ 11,703 | $ 11,550
Crude oil | 41,816 | 73,133
Caustic soda | 5,723 | 4,593
NaHS | 9,524 | 9,304
Other | 21 | 7
Total | $ 68,787 | $ 98,587

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