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Inventories (Details) $ in Thousands, bu in Millions | Mar. 31, 2018 USD ($) bu | Dec. 31, 2017 USD ($) bu | Mar. 31, 2017 USD ($) bu
--- | --- | --- | ---
Inventory, Net [Abstract] |  |  |
Grain | $ 541,272 | $ 505,217 | $ 443,870
Ethanol and co-products | 14,320 | 11,003 | 15,549
Plant nutrients and cob products | 170,748 | 126,962 | 165,584
Retail merchandise | 0 | 0 | 11,082
Railcar repair parts | 5,289 | 5,521 | 5,209
Total inventories | $ 731,629 | $ 648,703 | $ 641,294
Bushels of grain held in storage and excluded from inventory calculations | bu | 0.7 | 1.0 | 2.7

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