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Inventories (Details)
$ in Thousands, bu in Millions
Sep. 30, 2019
USD ($)
bu
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Inventory, Net [Abstract]      
Grain and other agricultural products $ 560,626 $ 527,471 $ 324,232
Frac sand and propane 14,592 0 0
Ethanol and co-products 26,218 11,918 15,419
Plant nutrients and cob products 133,839 145,693 145,363
Railcar repair parts 5,811 5,722 5,317
Total inventories $ 741,086 $ 690,804 $ 490,331
Bushels of grain held in storage for others and excluded from inventory calculations | bu 2.7