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Derivatives (Volume of Contracts Outstanding) (Details) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Mar. 31, 2019 lb | Mar. 31, 2019 bu | Mar. 31, 2019 T | Mar. 31, 2019 gal | Dec. 31, 2018 lb | Dec. 31, 2018 bu | Dec. 31, 2018 T | Dec. 31, 2018 gal | Mar. 31, 2018 lb | Mar. 31, 2018 bu | Mar. 31, 2018 T | Mar. 31, 2018 gal
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,739 | 1,168,112 | 2,713 | 373,930 | 2,920 | 506,417 | 66 | 323,975 | 5,048 | 717,171 | 90 | 392,851
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,739 | 818,315 | 2,508 | 235,452 | 2,920 | 313,612 | 66 | 246,863 | 5,048 | 441,111 | 90 | 284,743
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 624,612 | 0 | 0 |  | 250,408 | 0 |  | 0 | 335,887 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 42,859 | 0 | 0 | 0 | 22,463 | 0 | 0 | 0 | 48,003 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 118,909 | 0 | 0 | 0 | 14,017 | 0 | 0 | 0 | 16,639 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 26,361 | 0 | 0 | 0 | 26,230 | 0 | 0 | 0 | 40,555 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount |  | 0 | 0 | 233,420 | 0 | 0 | 0 | 244,863 |  | 0 | 0 | 280,243
Non-exchange Traded | Corn oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,733 | 0 | 0 | 0 | 2,920 | 0 | 0 | 0 | 5,048 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6 | 5,574 | 2,508 | 2,032 | 0 | 494 | 66 | 2,000 |  | 27 | 90 | 4,500
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 349,797 | 205 | 138,478 | 0 | 192,805 | 0 | 77,112 | 0 | 276,060 | 0 | 108,108
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 197,210 | 0 | 0 | 0 | 130,585 | 0 | 0 | 0 | 146,505 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 47,860 | 0 | 0 | 0 | 26,985 | 0 | 0 | 0 | 52,460 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 103,955 |  | 0 | 0 | 33,760 | 0 | 0 | 0 | 74,805 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 770 | 0 | 0 | 0 | 1,475 | 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 | 110,758 | 0 | 0 | 0 | 77,112 | 0 | 0 | 0 | 108,108
Exchange Traded | Gasoline |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 12,936 |  |  |  |  |  |  |  |
Exchange Traded | Propane |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 14,784 |  |  |  |  |  |  |  |
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 2 | 205 | 0 |  |  |  |  |  |  |  |

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