Goodwill And Intangible Assets (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 182,879	$ 183,696
Adjustment to preliminary Fleischmann's Vinegar Valuation		(817)
Dispositions	(148,190)
Goodwill, Ending Balance	34,689	182,879
Ethanol Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	30,279	30,279
Dispositions	(6,188)
Goodwill, Ending Balance	24,091	30,279
Food and Ingredients [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	142,002	142,819
Adjustment to preliminary Fleischmann's Vinegar Valuation		(817)
Dispositions	(142,002)
Goodwill, Ending Balance		142,002
Partnership [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	10,598	10,598
Goodwill, Ending Balance	$ 10,598	$ 10,598