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Derivatives (Details 3) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Mar. 31, 2018 lb | Mar. 31, 2018 bu | Mar. 31, 2018 T | Mar. 31, 2018 gal | Dec. 31, 2017 lb | Dec. 31, 2017 bu | Dec. 31, 2017 T | Dec. 31, 2017 gal | Mar. 31, 2017 lb | Mar. 31, 2017 bu | Mar. 31, 2017 T | Mar. 31, 2017 gal
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Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 5,048 | 717,171 | 90 | 392,851 | 6,074 | 464,085 | 97 | 237,885 | 6,279 | 480,042 | 254 | 195,630
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 5,048 | 441,111 | 90 | 284,743 | 6,074 | 277,095 | 97 | 197,607 | 6,279 | 285,132 | 239 | 179,040
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 335,887 | 0 | 0 |  | 218,391 | 0 |  | 0 | 201,200 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 48,003 | 0 | 0 | 0 | 18,127 | 0 | 0 | 0 | 29,015 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 16,639 | 0 | 0 | 0 | 14,577 | 0 | 0 | 0 | 7,956 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 40,555 | 0 | 0 | 0 | 25,953 | 0 | 0 | 0 | 46,861 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 0 | 0 | 280,243 | 0 | 0 | 0 | 197,607 | 0 | 0 | 0 | 178,040
Non-exchange Traded | Corn Oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 5,048 | 0 | 0 | 0 | 6,074 | 0 | 0 | 0 | 6,279 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 27 | 90 | 4,500 | 0 | 47 | 97 | 0 | 0 | 100 | 239 | 1,000
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 276,060 | 0 | 108,108 | 0 | 186,990 | 0 | 40,278 | 0 | 194,910 | 15 | 16,590
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 146,505 | 0 | 0 | 0 | 82,835 | 0 | 0 | 0 | 104,790 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 52,460 | 0 | 0 | 0 | 37,170 | 0 | 0 | 0 | 47,605 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 74,805 | 0 | 0 | 0 | 65,640 | 0 | 0 | 0 | 40,855 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 2,290 | 0 | 0 | 0 | 1,345 | 0 | 0 | 0 | 1,660 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 108,108 | 0 | 0 | 0 | 39,438 | 0 | 0 | 0 | 16,590
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  |  | 0 | 0 | 0 | 840 | 0 | 0 | 15 | 0

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