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Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory, Net |  |
Finished products and work in process | $ 41,982 | $ 48,500
Raw materials | 5,970 | 4,289
Inventories, net | 47,952 | 52,789
Valued at lower of cost or market: |  |
LIFO basis | 32,404 | 31,072
Valued at lower of cost and net realizable value: |  |
FIFO or average cost basis | 15,548 | 21,717
Inventories, net | $ 47,952 | $ 52,789

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