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Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Inventory at FIFO |  |
Finished goods | $ 13,131 | $ 2,878
Materials and products in process | 65,880 | 77,609
Gross inventories | 79,011 | 80,487
Less: LIFO reserve | (47,137) | (48,016)
Less: excess and obsolescence reserve | (3,573) | (3,394)
Net inventories | 28,301 | $ 29,077
Effect of liquidation of LIFO inventory | $ 200 |

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