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Inventories (Major Components of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Petroleum products	$ 4,585	$ 12,203
Crude oil	24,238	8,379
Caustic soda	8,040	10,372
NaHS	8,632	12,400
Raw materials - Alkali operations	6,401	5,952
Work-in-process - Alkali operations	6,343	2,322
Finished goods, net - Alkali operations	10,941	11,402
Materials and supplies, net - Alkali operations	10,967	10,490
Other	0	11
Total	$ 80,147	$ 73,531

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Carrying amount of caustic soda as of the balance sheet date.

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Carrying amount of sodium hydrosulfide (NaHS) as of the balance sheet date.

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Carrying amount as of the balance sheet date of petroleum or crude oil.

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Carrying amount as of the balance sheet date of finished goods inventories for petroleum products, crude oil, petrochemical products, and other oil and gas inventories.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Amount before valuation and LIFO reserves of other inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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