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Derivatives (Details 3) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Sep. 30, 2017 lb | Sep. 30, 2017 bu | Sep. 30, 2017 T | Sep. 30, 2017 gal | Dec. 31, 2016 lb | Dec. 31, 2016 bu | Dec. 31, 2016 T | Dec. 31, 2016 gal | Sep. 30, 2016 lb | Sep. 30, 2016 bu | Sep. 30, 2016 T | Sep. 30, 2016 gal
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Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 5,782 | 533,750 | 110 | 225,251 | 9,358 | 391,161 | 110 | 294,345 | 7,153 | 507,262 | 251 | 265,952
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 5,782 | 311,850 | 110 | 201,521 | 9,358 | 239,451 | 110 | 216,225 | 7,153 | 324,107 | 251 | 191,906
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 222,287 | 0 | 0 | 0 | 175,549 | 0 | 0 | 0 | 226,492 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 44,463 | 0 | 0 | 0 | 20,592 | 0 | 0 | 0 | 60,614 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 8,598 | 0 | 0 | 0 | 7,177 | 0 | 0 | 0 | 7,933 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 36,451 | 0 | 0 | 0 | 36,025 | 0 | 0 | 0 | 28,939 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 0 | 0 | 201,521 | 0 | 0 | 0 | 215,081 | 0 | 0 | 0 | 191,906
Non-exchange Traded | Corn Oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 5,782 | 0 | 0 | 0 | 9,358 | 0 | 0 | 0 | 7,153 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 51 | 110 | 0 | 0 | 108 | 110 | 1,144 | 0 | 129 | 251 | 0
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 221,900 | 0 | 23,730 | 0 | 151,710 | 0 | 78,120 | 0 | 183,155 | 0 | 74,046
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 113,990 | 0 | 0 | 0 | 63,225 | 0 | 0 | 0 | 105,395 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 45,220 | 0 | 0 | 0 | 39,005 | 0 | 0 | 0 | 35,245 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 61,795 | 0 | 0 | 0 | 45,360 | 0 | 0 | 0 | 39,715 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 895 | 0 | 0 | 0 | 4,120 | 0 | 0 | 0 | 2,800 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 22,890 | 0 | 0 | 0 | 78,120 | 0 | 0 | 0 | 74,046
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 840 |  |  |  |  |  |  |  |

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