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Derivatives (Volume of Contracts Outstanding) (Details) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands	Sep. 30, 2019 lb	Sep. 30, 2019 bu	Sep. 30, 2019 T	Sep. 30, 2019 gal	Dec. 31, 2018 lb	Dec. 31, 2018 bu	Dec. 31, 2018 T	Dec. 31, 2018 gal	Sep. 30, 2018 lb	Sep. 30, 2018 bu	Sep. 30, 2018 T	Sep. 30, 2018 gal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	5,385	1,258,761	3,467	421,253	2,920	506,417	66	323,975	2,560	562,872	115	324,087
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	5,385	842,811	3,178	262,965	2,920	313,612	66	246,863	2,560	362,632	115	231,813
Non-exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	653,757	0	0	0	250,408	0	0	0	277,774	0	0
Non-exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	46,895	0	0	0	22,463	0	0	0	45,755	0	0
Non-exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	90,598	0	0	0	14,017	0	0	0	7,948	0	0
Non-exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	36,365	0	0	0	26,230	0	0	0	31,155	0	0
Non-exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	0	256,815	0	0	0	244,863	0	0	0	230,813
Non-exchange Traded | Corn oil
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	5,022	0	0	0	2,920	0	0	0	2,560	0	0	0
Non-exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	363	15,196	3,178	6,150	0	494	66	2,000		0	115	1,000
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	415,950	289	158,288	0	192,805	0	77,112	0	200,240	0	92,274
Exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	280,890	0	0	0	130,585	0	0	0	123,250	0	0
Exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	58,980	0	0	0	26,985	0	0	0	31,855	0	0
Exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	75,345	0	0	0	33,760	0	0	0	44,130	0	0
Exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	735	0	0	0	1,475	0	0	0	1,005	0	0
Exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	0	145,769	0	0	0	77,112	0	0	0	92,274
Exchange Traded | Propane
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	0	12,516
Exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	289	3

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
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