Board of Directors, Term of Service

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Common Stock, Number of Board Members Shareholders Entitled To Elect

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Minimum Single Shareholder Ownership Percentage to Call Stockholder Meeting

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Number of Board Members Shareholders Entitled To Elect

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Preferred Stock, Number of Board Members Shareholders Entitled To Elect

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity unit purchase agreements using the treasury stock method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1707-109256

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-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1757-109256

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of stock repurchase plan authorized.

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Equity and EPS (Details)		12 Months Ended
Equity and EPS (Details)	Sep. 01, 2015 USD ($) shares	Dec. 31, 2017 board_member shares	Jul. 03, 2017	Dec. 31, 2016 shares	Feb. 26, 2016	Dec. 31, 2015 shares	Dec. 31, 2014 shares
Equity [Abstract]
Number of board members that common stockholders are entitled to elect \| board_member		4
Total number of board members \| board_member		9
Number of board members preferred stock shareholders entitled to elect \| board_member		5
Board of directors, term of service		1 year
Minimum single shareholder ownership percentage to call special stockholder meeting (as a percent)		10.00%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental common shares attributable to dilutive effect of equity unit purchase agreements \| shares	950,000
Stock repurchase program, authorized amount \| $	$ 14,488,000
Illinois Corn Processings LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity method ownership percentage	30.00%		30.00%		30.00%
Illinois Corn Processings LLC \| Affiliated Entity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity method ownership percentage	70.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares \| shares		368,492		527,486		437,946	413,288
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares \| shares		0		0		128,500	278,900