Acquisitions And Dispositions (Schedule Of Identifiable Assets Acquired And Liabilities Assumed) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Aug. 01, 2018	Dec. 31, 2017	May 16, 2017	Dec. 31, 2016	Oct. 03, 2016	Sep. 23, 2016
Business Acquisition [Line Items]
Goodwill	$ 34,689		$ 182,879		$ 183,696
Net assets acquired	$ 124,407		$ 61,727		$ 508,143
Asset Purchase Agreement With Bartlett Cattle Company L.P. [Member]
Business Acquisition [Line Items]
Accounts receivable, net		$ 1,897
Inventory		104,809
Property and equipment, net		16,190
Current liabilities		(118)
Total identifiable net assets		$ 122,778
Asset Purchase Agreement With Cargill Cattle Feeders LLC [Member]
Business Acquisition [Line Items]
Inventory				$ 22,450
Prepaid expenses and other				52
Property and equipment, net				36,960
Current liabilities				(180)
Total identifiable net assets				$ 59,282
Fleischmann’s Vinegar [Member]
Business Acquisition [Line Items]
Cash						$ 4,148
Accounts receivable, net						13,919
Inventory						9,308
Prepaid expenses and other						1,054
Property and equipment, net						49,175
Intangible assets						90,500
Current liabilities						(9,689)
Income taxes payable						(216)
Deferred tax liabilities						(41,882)
Total identifiable net assets						116,317
Goodwill						142,002
Net assets acquired						$ 258,319
Acquisition of Abengoa Ethanol Plants [Member]
Business Acquisition [Line Items]
Accounts receivable, net							$ 1,826
Inventory							16,904
Prepaid expenses and other							2,224
Property and equipment, net							234,947
Other assets							3,885
Current maturities of long-term debt							(406)
Current liabilities							(2,580)
Long-term debt							(2,763)
Total identifiable net assets							$ 254,037