Goodwill And Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill Attributable To Each Business Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 182,879
Dispositions	[1]	(148,190)
Goodwill, Ending Balance		34,689
Goodwill		34,689	$ 34,689
Ethanol Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		30,279
Dispositions	[1]	(6,188)
Goodwill, Ending Balance		24,091
Goodwill		24,091	24,091
Food And Ingredients [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		142,002
Dispositions	[1]	(142,002)
Goodwill		142,002
Partnership [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		10,598
Goodwill, Ending Balance		10,598
Goodwill		10,598	$ 10,598
Fleischmann's Vinegar [Member]
Goodwill [Line Items]
Dispositions		(142,000)
Bluffton, Lakota and Riga Ethanol Plants [Member]
Goodwill [Line Items]
Dispositions		$ (6,200)

[1] As of December 31, 2018, in connection with the sale of the Bluffton, Lakota and Riga ethanol plants and Fleischmann’s Vinegar, the fair value of goodwill was reduced by $6.2 million and $142.0 million, respectively.