Derivatives (Comodity Derivative Contracts Outstanding) (Details) gal in Thousands, bu in Thousands, T in Thousands	Dec. 31, 2021 bu	Dec. 31, 2021 gal	Dec. 31, 2021 T	Dec. 31, 2020 bu	Dec. 31, 2020 gal	Dec. 31, 2020 T
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	1,319,055	341,763	3,258	1,303,744	220,429	2,039
Non-exchange traded
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	961,715	208,539	2,905	899,689	126,853	1,890
Non-exchange traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	685,681	0	0	684,654	0	0
Non-exchange traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	77,592	0	0	73,521	0	0
Non-exchange traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	109,547	0	0	109,661	0	0
Non-exchange traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	31,627	0	0	27,482	0	0
Non-exchange traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	0	192,447	0	0	124,795	0
Non-exchange traded | Soybean meal
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	0	0	544	0	0	398
Non-exchange traded | Dried distillers grain
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	0	0	507	0	0	319
Non-exchange traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	57,268	16,092	1,854	4,371	2,058	1,173
Exchange traded
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	357,340	133,224	353	404,055	93,576	149
Exchange traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	226,215	0	0	267,792	0	0
Exchange traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	64,730	0	0	53,730	0	0
Exchange traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	65,020	0	0	80,733	0	0
Exchange traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	1,300	0	0	1,800	0	0
Exchange traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	0	100,884	0	0	73,584	0
Exchange traded | Propane
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	0	31,542	0	0	17,094	0
Exchange traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Derivative, Nonmonetary Notional Amount	75	798	353	0	2,898	149