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Derivatives (Volume of Contracts Outstanding) (Details) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands | Mar. 31, 2020 lb | Mar. 31, 2020 bu | Mar. 31, 2020 T | Mar. 31, 2020 gal | Dec. 31, 2019 lb | Dec. 31, 2019 bu | Dec. 31, 2019 T | Dec. 31, 2019 gal | Mar. 31, 2019 lb | Mar. 31, 2019 bu | Mar. 31, 2019 T | Mar. 31, 2019 gal
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,571 | 1,021,217 | 2,223 | 172,922 | 14,873 | 1,055,476 | 2,495 | 300,982 | 6,739 | 1,168,112 | 2,713 | 373,930
Non-exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,571 | 757,422 | 2,010 | 104,752 | 14,873 | 724,330 | 2,263 | 120,448 | 6,739 | 818,315 | 2,508 | 235,452
Non-exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 555,782 | 0 | 0 | 0 | 552,359 | 0 | 0 | 0 | 624,612 | 0 | 0
Non-exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 33,950 | 0 | 0 | 0 | 34,912 | 0 | 0 | 0 | 42,859 | 0 | 0
Non-exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 92,374 | 0 | 0 | 0 | 100,996 | 0 | 0 | 0 | 118,909 | 0 | 0
Non-exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 56,582 | 0 | 0 | 0 | 24,700 | 0 | 0 | 0 | 26,361 | 0 | 0
Non-exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 103,252 | 0 | 0 | 0 | 116,448 | 0 | 0 | 0 | 233,420
Non-exchange Traded | Corn oil |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 6,275 | 0 | 0 | 0 | 14,568 | 0 | 0 | 0 | 6,733 | 0 | 0 | 0
Non-exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 296 | 18,734 | 2,010 | 1,500 | 305 | 11,363 | 2,263 | 4,000 | 6 | 5,574 | 2,508 | 2,032
Exchange Traded |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 263,795 | 213 | 68,170 | 0 | 331,146 | 232 | 180,534 | 0 | 349,797 | 205 | 138,478
Exchange Traded | Corn |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 165,295 | 0 | 0 | 0 | 221,740 | 0 | 0 | 0 | 197,210 | 0 | 0
Exchange Traded | Soybeans |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 37,875 | 0 | 0 | 0 | 39,145 | 0 | 0 | 0 | 47,860 | 0 | 0
Exchange Traded | Wheat |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 59,135 | 0 | 0 | 0 | 68,171 | 0 | 0 | 0 | 103,955 | 0 | 0
Exchange Traded | Oats |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 1,490 | 0 | 0 | 0 | 2,090 | 0 | 0 | 0 | 770 | 0 | 0
Exchange Traded | Ethanol |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 0 | 44,440 | 0 | 0 | 0 | 175,353 | 0 | 0 | 0 | 110,758
Exchange Traded | Natural Gas Liquids [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 | 11,760 | 0 | 0 | 0 | 5,166 | 0 | 0 | 0 | 14,784
Exchange Traded | Other |  |  |  |  |  |  |  |  |  |  |  |
Amounts of quantities outstanding included in commodity derivative contracts |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount | 0 | 0 | 213 | 11,970 | 0 | 0 | 232 | 15 | 0 | 2 | 205 | 0

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