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Derivatives (Volume of Contracts Outstanding) (Details) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Jun. 30, 2018 lb | Jun. 30, 2018 bu | Jun. 30, 2018 T | Jun. 30, 2018 gal | Dec. 31, 2017 lb | Dec. 31, 2017 bu | Dec. 31, 2017 T | Dec. 31, 2017 gal | Jun. 30, 2017 lb | Jun. 30, 2017 bu | Jun. 30, 2017 T | Jun. 30, 2017 gal
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Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,158 | 598,844 | 77 | 474,625 | 6,074 | 464,085 | 97 | 237,885 | 4,658 | 433,265 | 160 | 261,848
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,158 | 370,044 | 77 | 334,261 | 6,074 | 277,095 | 97 | 197,607 | 4,658 | 264,685 | 100 | 257,018
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 272,979 | 0 | 0 |  | 218,391 | 0 |  | 0 | 184,197 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 49,208 | 0 | 0 | 0 | 18,127 | 0 | 0 | 0 | 31,532 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 11,163 | 0 | 0 | 0 | 14,577 | 0 | 0 | 0 | 7,340 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 36,612 | 0 | 0 | 0 | 25,953 | 0 | 0 | 0 | 41,526 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 0 | 0 | 332,761 | 0 | 0 | 0 | 197,607 | 0 | 0 | 0 | 256,518
Non-exchange Traded | Corn Oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,158 | 0 | 0 | 0 | 6,074 | 0 | 0 | 0 | 4,658 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 82 | 77 | 1,500 | 0 | 47 | 97 | 0 | 0 | 90 | 100 | 500
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 228,800 | 0 | 140,364 | 0 | 186,990 | 0 | 40,278 | 0 | 168,580 | 60 | 4,830
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 133,730 | 0 | 0 | 0 | 82,835 | 0 | 0 | 0 | 94,895 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 45,775 | 0 | 0 | 0 | 37,170 | 0 | 0 | 0 | 27,470 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 48,105 | 0 | 0 | 0 | 65,640 | 0 | 0 | 0 | 43,925 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 1,190 | 0 | 0 | 0 | 1,345 | 0 | 0 | 0 | 2,290 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 140,364 | 0 | 0 | 0 | 39,438 | 0 | 0 | 0 | 3,990
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  |  | 0 | 0 | 0 | 840 | 0 | 0 | 60 | 840

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