Segment Information (Summary Of Total Assets For Operating Segments) (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	[1]	$ 1,698,218	$ 2,216,432
Operating Segments [Member] | Ethanol Production [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	884,293	872,845
Operating Segments [Member] | Agribusiness and Energy Services [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	410,400	399,633
Operating Segments [Member] | Partnership [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	90,011	67,297
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	(10,766)	(10,038)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	$ 324,280	334,236
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total assets	[1]		$ 552,459

[1] Asset balances by segment exclude intercompany payable and receivable balances