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Inventories (Schedule of Major Components of Inventories) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Inventory Disclosure [Abstract] |  |
Petroleum products | $ 8,731,000 | $ 11,550,000
Crude oil | 29,873,000 | 73,133,000
Caustic soda | 5,755,000 | 4,593,000
NaHS | 8,277,000 | 9,304,000
Raw materials - Alkali Operations | 4,550,000 | 0
Work-in-process - Alkali Operations | 7,355,000 | 0
Finished goods, net - Alkali Operations | 14,075,000 | 0
Materials and supplies, net - Alkali Operations | 10,030,000 | 0
Other | 7,000 | 7,000
Total | 88,653,000 | 98,587,000
Inventory write-down | $ 0 | $ 0

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