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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended	77 Months Ended
	Jan. 21, 2021	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Treasury stock, shares		11,813,161	11,813,161	10,932,182
Treasury Stock, Value		$ 131,287	$ 131,287	$ 119,808
Stock Repurchase Program, Authorized Amount		$ 200,000	$ 200,000
Repurchase of common stock, Shares		880,979	7,396,936
Repurchase of common stock		$ 11,500	$ 92,800
Unrealized losses, net of tax		$ (2,172)	$ (2,172)	$ (11,064)
Subsequent Event [Member] | Green Plains Partners LP [Member]
Quarterly cash distribution per unit declared	$ 0.12

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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