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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Restricted Cash and Cash Equivalents $ 8,700    
Summary of Significant Accounting Policies (Textual) [Abstract]      
Maximum period in which contracts for the sale of grain to processors or other consumers extend 1 year    
Marketing lease agreement term 5 years    
Marketing balance payable   $ 200 $ 3,700
Property subject to or available for leases statutory life minimum 40 years    
Property subject to or available for leases statutory life maximum 50 years    
Accrued compensation liability $ 6,700 7,500  
Decrease in retained earnings $ (642,687) (647,517)  
Minimum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Intangible assets estimated useful life 1 year    
Maximum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Intangible assets estimated useful life 10 years    
Operating, administrative and general expenses      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Advertising expense $ 2,500 $ 1,900 $ 2,500
Barges | Minimum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 30 years    
Barges | Maximum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 40 years    
Land Improvements      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 16 years    
Leasehold Improvements | Minimum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 3 years    
Leasehold Improvements | Maximum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 20 years    
Buildings and Storage Facilities | Minimum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 10 years    
Buildings and Storage Facilities | Maximum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 40 years    
Machinery and Equipment | Minimum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 3 years    
Machinery and Equipment | Maximum      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Asset estimated average useful life 20 years