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Derivatives (Volume of Contracts Outstanding) (Details) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Sep. 30, 2018 lb | Sep. 30, 2018 bu | Sep. 30, 2018 T | Sep. 30, 2018 gal | Dec. 31, 2017 lb | Dec. 31, 2017 bu | Dec. 31, 2017 T | Dec. 31, 2017 gal | Sep. 30, 2017 lb | Sep. 30, 2017 bu | Sep. 30, 2017 T | Sep. 30, 2017 gal
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Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 2,560 | 562,872 | 115 | 324,087 | 6,074 | 464,085 | 97 | 237,885 | 5,782 | 533,750 | 110 | 225,251
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 2,560 | 362,632 | 115 | 231,813 | 6,074 | 277,095 | 97 | 197,607 | 5,782 | 311,850 | 110 | 201,521
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 277,774 | 0 | 0 |  | 218,391 | 0 |  | 0 | 222,287 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 45,755 | 0 | 0 | 0 | 18,127 | 0 | 0 | 0 | 44,463 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 7,948 | 0 | 0 | 0 | 14,577 | 0 | 0 | 0 | 8,598 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 31,155 | 0 | 0 | 0 | 25,953 | 0 | 0 | 0 | 36,451 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 0 | 0 | 230,813 | 0 | 0 | 0 | 197,607 |  | 0 | 0 | 201,521
Non-exchange Traded | Corn Oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 2,560 | 0 | 0 | 0 | 6,074 | 0 | 0 | 0 | 5,782 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 115 | 1,000 | 0 | 47 | 97 | 0 |  | 51 | 110 | 0
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 200,240 | 0 | 92,274 | 0 | 186,990 | 0 | 40,278 | 0 | 221,900 | 0 | 23,730
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 123,250 | 0 | 0 | 0 | 82,835 | 0 | 0 | 0 | 113,990 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 31,855 | 0 | 0 | 0 | 37,170 | 0 | 0 | 0 | 45,220 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 44,130 | 0 | 0 | 0 | 65,640 | 0 | 0 | 0 | 61,795 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 1,005 | 0 | 0 | 0 | 1,345 | 0 | 0 | 0 | 895 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 92,274 | 0 | 0 | 0 | 39,438 | 0 | 0 | 0 | 22,890
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  |  | 0 | 0 | 0 | 840 | 0 | 0 | 0 | 840

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