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Derivatives (Details 3) lb in Thousands, gal in Thousands, bu in Thousands, T in Thousands	Mar. 31, 2018 lb	Mar. 31, 2018 bu	Mar. 31, 2018 T	Mar. 31, 2018 gal	Dec. 31, 2017 lb	Dec. 31, 2017 bu	Dec. 31, 2017 T	Dec. 31, 2017 gal	Mar. 31, 2017 lb	Mar. 31, 2017 bu	Mar. 31, 2017 T	Mar. 31, 2017 gal
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	5,048	717,171	90	392,851	6,074	464,085	97	237,885	6,279	480,042	254	195,630
Non-exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	5,048	441,111	90	284,743	6,074	277,095	97	197,607	6,279	285,132	239	179,040
Non-exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	335,887	0	0		218,391	0		0	201,200	0	0
Non-exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	48,003	0	0	0	18,127	0	0	0	29,015	0	0
Non-exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	16,639	0	0	0	14,577	0	0	0	7,956	0	0
Non-exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	40,555	0	0	0	25,953	0	0	0	46,861	0	0
Non-exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount		0	0	280,243	0	0	0	197,607	0	0	0	178,040
Non-exchange Traded | Corn Oil
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	5,048	0	0	0	6,074	0	0	0	6,279	0	0	0
Non-exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount		27	90	4,500	0	47	97	0	0	100	239	1,000
Exchange Traded
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	276,060	0	108,108	0	186,990	0	40,278	0	194,910	15	16,590
Exchange Traded | Corn
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	146,505	0	0	0	82,835	0	0	0	104,790	0	0
Exchange Traded | Soybeans
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	52,460	0	0	0	37,170	0	0	0	47,605	0	0
Exchange Traded | Wheat
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	74,805	0	0	0	65,640	0	0	0	40,855	0	0
Exchange Traded | Oats
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	2,290	0	0	0	1,345	0	0	0	1,660	0	0
Exchange Traded | Ethanol
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount	0	0	0	108,108	0	0	0	39,438	0	0	0	16,590
Exchange Traded | Other
Amounts of quantities outstanding included in commodity derivative contracts
Nonmonetary notional amount					0	0	0	840	0	0	15	0

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Commodity derivative contract quantity disclosure

+ References

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Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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