Basis of Presentation and Description of Business (Narrative) (Details) $ in Thousands, gal in Billions			3 Months Ended	12 Months Ended
	Sep. 23, 2016 USD ($) property	Jan. 01, 2016 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) item bbl gal
Basis of Presentation and Significant Accounting Policies [Line Items]
Contribution to joint venture				$ 2,248
NLR Energy Logistics LLC [Member]
Basis of Presentation and Significant Accounting Policies [Line Items]
Contribution to joint venture				$ 2,200
Equity Method Investment, Ownership Percentage				50.00%
Number of train car units | item				110
Number of barrels of storage | bbl				100,000
NLR Energy Logistics LLC [Member] | Scenario, Forecast [Member]
Basis of Presentation and Significant Accounting Policies [Line Items]
Construction costs			$ 7,000
Green Plains Inc. [Member]
Basis of Presentation and Significant Accounting Policies [Line Items]
Ethanol production capacity | gal				1.5
Assets of Hereford, Texas and Hopewell, Virginia [Member]
Basis of Presentation and Significant Accounting Policies [Line Items]
Consideration transferred		$ 62,312
Assets of Abengoa [Member]
Basis of Presentation and Significant Accounting Policies [Line Items]
Consideration transferred	$ 90,000
Number of ethanol plants | property	3