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Inventories (Details) $ in Thousands, bu in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) bu | Mar. 31, 2020 USD ($) bu | Dec. 31, 2020 USD ($) bu
Inventory [Line Items] |  |  |
Grain and other agricultural products | $ 971,914 | $ 750,281 | $ 1,025,809
Frac sand and propane | 8,388 | 5,723 | 12,477
Ethanol and co-products | 136,234 | 87,706 | 114,895
Plant nutrients and cob products | 171,101 | 178,028 | 139,885
Railcar repair parts | 7,424 | 6,338 | 7,627
Total inventories | 1,295,061 | 1,028,076 | 1,300,693
Readily marketable inventory | $ 942,400 | $ 712,300 | $ 983,200
Bushels of grain held in storage for others and excluded from inventory calculations | bu | 1.6 | 3.9 | 3.0
Inventory write down | $ 2,479 | $ 10,571 |
COVID-19 Pandemic |  |  |
Inventory [Line Items] |  |  |
Inventory write down |  | $ 10,600 |

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