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Inventories (Details) $ in Thousands, bu in Millions | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) bu | Mar. 31, 2018 USD ($) bu
--- | --- | --- | ---
Inventory, Net [Abstract] |  |  |
Grain and other agricultural products | $ 812,361 | $ 527,471 | $ 541,272
Frac sand and propane | 8,172 | 0 | 0
Ethanol and co-products | 16,302 | 11,918 | 14,320
Plant nutrients and cob products | 183,886 | 145,693 | 170,748
Railcar repair parts | 5,744 | 5,722 | 5,289
Total inventories | $ 1,026,465 | $ 690,804 | $ 731,629
Bushels of grain held in storage for others and excluded from inventory calculations | bu |  | 0.7 | 1.9

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