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Inventories (Details) $ in Thousands, bu in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) bu | Jun. 30, 2020 USD ($) bu | Dec. 31, 2020 USD ($) bu
Inventory [Line Items] |  |  |
Grain and other agricultural products | $ 636,380 | $ 452,339 | $ 1,025,809
Frac sand and propane | 11,265 | 6,498 | 12,477
Ethanol and co-products | 155,993 | 63,195 | 114,895
Plant nutrients and cob products | 101,286 | 87,346 | 139,885
Railcar repair parts | 7,375 | 6,945 | 7,627
Total inventories | 912,299 | 616,323 | 1,300,693
Readily marketable inventory | $ 612,200 | $ 418,000 | $ 983,200
Bushels of grain held in storage for others and excluded from inventory calculations | bu | 1.2 | 1.7 | 3.0
Inventory write down | $ 2,599 | $ 10,922 |
COVID-19 Pandemic |  |  |
Inventory [Line Items] |  |  |
Inventory write down |  | $ 10,900 |

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