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Inventories (Details) $ in Thousands, bu in Millions | Sep. 30, 2017 USD ($) bu | Dec. 31, 2016 USD ($) bu | Sep. 30, 2016 USD ($) bu
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Inventory, Net [Abstract] |  |  |
Grain | $ 342,837 | $ 495,139 | $ 262,165
Ethanol and co-products | 12,502 | 10,887 | 7,734
Plant nutrients and cob products | 114,131 | 150,259 | 126,922
Retail merchandise | 718 | 20,678 | 24,985
Railcar repair parts | 5,414 | 5,784 | 5,948
Total inventories | $ 475,602 | $ 682,747 | $ 427,754
Bushels of grain held in storage and excluded from inventory calculations | bu | 1.0 | 0.9 | 1.0

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