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Derivatives (Details 3) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Sep. 30, 2016 lb | Sep. 30, 2016 bu | Sep. 30, 2016 T | Sep. 30, 2016 gal | Dec. 31, 2015 lb | Dec. 31, 2015 bu | Dec. 31, 2015 T | Dec. 31, 2015 gal | Sep. 30, 2015 lb | Sep. 30, 2015 bu | Sep. 30, 2015 T | Sep. 30, 2015 gal
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Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 7,153 | 507,262 | 251 | 265,952 | 11,532 | 424,761 | 116 | 140,340 | 10,063 | 597,915 | 123 | 134,981
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 7,153 | 324,107 | 251 | 191,906 | 11,532 | 269,631 | 116 | 138,660 | 10,063 | 411,600 | 123 | 131,789
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 226,492 | 0 | 0 | 0 | 227,248 | 0 | 0 | 0 | 331,740 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 60,614 | 0 | 0 | 0 | 13,357 | 0 | 0 | 0 | 47,208 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 7,933 | 0 | 0 | 0 | 13,710 | 0 | 0 | 0 | 12,631 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 28,939 | 0 | 0 | 0 | 15,019 | 0 | 0 | 0 | 19,449 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 191,906 | 0 | 0 | 0 | 138,660 | 0 | 0 | 0 | 131,789
Non-exchange Traded | Corn Oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 7,153 | 0 | 0 | 0 | 11,532 | 0 | 0 | 0 | 10,063 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 129 | 251 | 0 | 0 | 297 | 116 | 0 | 0 | 572 | 123 | 0
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 183,155 | 0 | 74,046 | 0 | 155,130 | 0 | 1,680 | 0 | 186,315 | 0 | 3,192
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 105,395 | 0 | 0 | 0 | 106,260 | 0 | 0 | 0 | 129,810 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 35,245 | 0 | 0 | 0 | 17,255 | 0 | 0 | 0 | 24,860 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 39,715 | 0 | 0 | 0 | 28,135 | 0 | 0 | 0 | 28,360 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 2,800 | 0 | 0 | 0 | 3,480 | 0 | 0 | 0 | 3,285 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 74,046 | 0 | 0 | 0 | 840 | 0 | 0 | 0 | 3,192
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  |  |  |  | 0 | 0 | 0 | 840 |  |  |  |

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