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Inventories (Major Components of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Petroleum products $ 1,868 $ 2,721
Crude oil 29,012 5,271
Caustic soda 5,510 5,965
NaHS 10,056 10,845
Raw materials - Alkali operations 7,194 6,238
Work-in-process - Alkali operations 8,565 8,579
Finished goods, net - Alkali operations 15,086 14,168
Materials and supplies, net - Alkali operations 12,520 11,350
Total $ 89,811 $ 65,137