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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Major Components of Inventories
The major components of inventories were as follows:
September 30,
2020
December 31,
2019
Petroleum products$1,868 $2,721 
Crude oil29,012 5,271 
Caustic soda5,510 5,965 
NaHS10,056 10,845 
Raw materials - Alkali operations7,194 6,238 
Work-in-process - Alkali operations8,565 8,579 
Finished goods, net - Alkali operations15,086 14,168 
Materials and supplies, net - Alkali operations12,520 11,350 
Total$89,811 $65,137