Commitments and Contingencies (Components Of Lease Revenue) (Details) $ in Thousands			3 Months Ended		9 Months Ended
		Jul. 01, 2020 $ / gal	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / gal	Sep. 30, 2019 USD ($)
Related Party Transaction [Line Items]
Operating lease revenue			$ 17,613	$ 16,981	$ 51,744	$ 51,751
Variable lease revenue	[1]		544	(259)	571	(457)
Sublease revenue			16	111	152	539
Total lease revenue			$ 18,173	$ 16,833	$ 52,467	$ 51,833
Fee-based Storage and Throughput Agreement [Member] | Green Plains Trade [Member]
Related Party Transaction [Line Items]
Agreement initial rate, price per gallon | $ / gal		0.05312			0.05

[1] Represents amounts charged to Green Plains Trade under the storage and throughput agreement in excess of the initial rate of $0.05 per gallon, amounts delivered by Green Plains Trade and other customers in excess of various minimum volume commitments, and the difference between the contracted railcar volumetric capacity and the actual amount provided to Green Plains Trade during the period.