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Goodwill And Intangible Assets (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Goodwill $ 182,879,000   $ 182,879,000   $ 182,879,000
Changes in the carrying amount of goodwill     0   0
Trade Names [Member]          
Indefinite-Lived Intangible Assets 10,500,000   10,500,000    
Acquisition of Fleischmann’s Vinegar Company, Inc. [Member} | Customer Relationships [Member]          
Finite-lived Intangible Assets Acquired     70,700,000    
Finite-Lived Intangible Assets, Accumulated Amortization 9,300,000   $ 9,300,000    
Finite-Lived Intangible Assets, Remaining Amortization Period     13 years 3 months 18 days    
Amortization of Intangible Assets 1,400,000 $ 1,400,000 $ 2,700,000 $ 2,800,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 5,300,000   5,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 5,300,000   5,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 5,300,000   5,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 5,300,000   5,300,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 5,300,000   5,300,000    
Ethanol Production [Member]          
Goodwill 30,300,000   30,300,000   30,300,000
Food And Ingredients [Member]          
Goodwill 142,000,000   142,000,000   142,000,000
Partnership [Member]          
Goodwill $ 10,600,000   $ 10,600,000   $ 10,600,000