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Inventories (Details) $ in Thousands, bu in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) bu | Dec. 31, 2019 USD ($) bu | Dec. 31, 2018 USD ($)
Inventory [Line Items] |  |  |
Agricultural Related Inventory | $ 1,025,809 | $ 907,482 |
Frac sand and propane | 12,477 | 15,438 |
Ethanol and co-products | 114,895 | 95,432 |
Plant nutrients and cob products | 139,885 | 146,164 |
Railcar repair parts | 7,627 | 6,020 |
Total inventories | $ 1,300,693 | $ 1,170,536 |
Grain held in storage and excluded from inventory calculations (bushels) | bu | 3.0 | 6.4 |
Inventory write-down | $ 11,676 | $ 0 | $ 0
COVID-19 Pandemic |  |  |
Inventory [Line Items] |  |  |
Inventory write-down | 11,700 |  |
Readily Marketable Inventory |  |  |
Inventory [Line Items] |  |  |
Agricultural Related Inventory | 972,800 | 852,600 |
Frac sand and propane | $ 10,400 | $ 10,600 |

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