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Debt (Schedule Of Short-term Notes Payable And Other Borrowings) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	$ 457,472,000	$ 526,180,000
Green Plains Cattle [Member] | Revolving Credit Facility [Member] | $425.0 Million Revolver [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	243,147,000	270,860,000
Debt instrument, face amount	425,000,000	425,000,000
Green Plains Grain [Member] | Revolving Credit Facility [Member] | $125.0 Million Revolver [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	71,800,000	75,000,000
Debt instrument, face amount	125,000,000	125,000,000
Green Plains Trade [Member] | Revolving Credit Facility [Member] | $300.0 Million Revolver [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	131,170,000	180,320,000
Debt instrument, face amount	300,000,000	300,000,000
Green Plains Commodity Management [Member] | $20.0 Million Hedge Line [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	11,355,000
Debt instrument, face amount	$ 20,000,000	$ 20,000,000

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

+ References

No definition available.

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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