Inventories (Details) $ in Thousands, bu in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) bu	Jun. 30, 2020 USD ($) bu	Dec. 31, 2020 USD ($) bu
Inventory [Line Items]
Grain and other agricultural products	$ 636,380	$ 452,339	$ 1,025,809
Frac sand and propane	11,265	6,498	12,477
Ethanol and co-products	155,993	63,195	114,895
Plant nutrients and cob products	101,286	87,346	139,885
Railcar repair parts	7,375	6,945	7,627
Total inventories	912,299	616,323	1,300,693
Readily marketable inventory	$ 612,200	$ 418,000	$ 983,200
Bushels of grain held in storage for others and excluded from inventory calculations | bu	1.2	1.7	3.0
Inventory write down	$ 2,599	$ 10,922
COVID-19 Pandemic
Inventory [Line Items]
Inventory write down		$ 10,900