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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Goodwill [Line Items]          
Reporting unit, percentage of fair value in excess of carrying amount         8.00%
Impairment of Intangible Assets (Excluding Goodwill)     $ 0    
Goodwill [Roll Forward]          
Balance as of January 1, 2017     63,934,000    
Acquisitions     1,171,000    
Impairments $ (42,000,000) $ 0 (42,000,000) $ 0  
Balance as of June 30, 2017 23,105,000 $ 63,934,000 23,105,000 $ 63,934,000  
Grain          
Goodwill [Roll Forward]          
Balance as of January 1, 2017     0    
Acquisitions     1,171,000    
Impairments     0    
Balance as of June 30, 2017 1,171,000   1,171,000    
Plant Nutrient          
Goodwill [Roll Forward]          
Balance as of January 1, 2017     59,767,000    
Acquisitions     0    
Impairments (42,000,000)   (42,000,000)    
Balance as of June 30, 2017 17,767,000   17,767,000    
Rail          
Goodwill [Roll Forward]          
Balance as of January 1, 2017     4,167,000    
Acquisitions     0    
Impairments     0    
Balance as of June 30, 2017 $ 4,167,000   $ 4,167,000