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Inventories (Major Components of Inventories) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
Petroleum products | $ 3,645 | $ 2,721
Crude oil | 3,133 | 5,271
Caustic soda | 5,821 | 5,965
NaHS | 13,473 | 10,845
Raw materials - Alkali operations | 5,999 | 6,238
Work-in-process - Alkali operations | 8,399 | 8,579
Finished goods, net - Alkali operations | 17,779 | 14,168
Materials and supplies, net - Alkali operations | 11,912 | 11,350
Total | $ 70,161 | $ 65,137

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