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Derivatives (Details 3) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Mar. 31, 2017 lb | Mar. 31, 2017 bu | Mar. 31, 2017 T | Mar. 31, 2017 gal | Dec. 31, 2016 lb | Dec. 31, 2016 bu | Dec. 31, 2016 T | Dec. 31, 2016 gal | Mar. 31, 2016 lb | Mar. 31, 2016 bu | Mar. 31, 2016 T | Mar. 31, 2016 gal
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Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,279 | 480,042 | 254 | 195,630 | 9,358 | 391,161 | 110 | 294,345 | 10,084 | 489,698 | 85 | 150,844
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,279 | 285,132 | 239 | 179,040 | 9,358 | 239,451 | 110 | 216,225 | 10,084 | 301,743 | 85 | 149,374
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 201,200 | 0 | 0 | 0 | 175,549 | 0 | 0 | 0 | 235,426 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 29,015 | 0 | 0 | 0 | 20,592 | 0 | 0 | 0 | 21,509 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 7,956 | 0 | 0 | 0 | 7,177 | 0 | 0 | 0 | 12,654 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 46,861 | 0 | 0 | 0 | 36,025 | 0 | 0 | 0 | 32,136 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 178,040 | 0 | 0 | 0 | 215,081 | 0 | 0 | 0 | 149,374
Non-exchange Traded | Corn Oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,279 | 0 | 0 | 0 | 9,358 | 0 | 0 | 0 | 3,850 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 100 | 239 | 1,000 | 0 | 108 | 110 | 1,144 | 6,234 | 18 | 85 | 0
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 194,910 | 15 | 16,590 | 0 | 151,710 | 0 | 78,120 | 0 | 187,955 | 0 | 1,470
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 104,790 | 0 | 0 | 0 | 63,225 | 0 | 0 | 0 | 129,465 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 47,605 | 0 | 0 | 0 | 39,005 | 0 | 0 | 0 | 34,315 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 40,855 | 0 | 0 | 0 | 45,360 | 0 | 0 | 0 | 20,950 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 1,660 | 0 | 0 | 0 | 4,120 | 0 | 0 | 0 | 3,225 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 16,590 | 0 | 0 | 0 | 78,120 | 0 | 0 | 0 | 1,470
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 15 | 0 |  |  |  |  |  |  |  |

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