Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018
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		$ 3,300	$ 5,800
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		$ 9,600	9,700
Decrease in retained earnings		$ (633,496)	(609,206)
Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Decrease in consolidated revenues percentage	10.00%
Decrease in cost of sales percentage	20.00%
Scenario, Forecast | Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Rail Group
Summary of Significant Accounting Policies (Textual) [Abstract]
Decrease in retained earnings					$ 18,000
Grain | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	95.00%
Decrease in consolidated revenues percentage	20.00%
Decrease in cost of sales percentage	30.00%
Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangible assets estimated useful life		3 years
Minimum | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	70.00%
Minimum | Ethanol | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	80.00%
Minimum | Rail | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	50.00%
Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangible assets estimated useful life		10 years
Maximum | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	80.00%
Maximum | Ethanol | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	90.00%
Maximum | Rail | Scenario, Forecast | Accounting Standards Update 2014-09
Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenue accounted for outside of scope of ASC 606	60.00%
Operating, administrative and general expenses
Summary of Significant Accounting Policies (Textual) [Abstract]
Advertising expense		$ 2,500	$ 4,900	$ 5,200
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
Assets, Net [Member] | Scenario, Forecast | Accounting Standards Update 2014-09 | Rail Group
Summary of Significant Accounting Policies (Textual) [Abstract]
Increase in net assets					25,000
Financing Obligations [Member] | Scenario, Forecast | Accounting Standards Update 2014-09 | Rail Group
Summary of Significant Accounting Policies (Textual) [Abstract]
Increase in financial liabilities and deferred tax liabilities					$ 43,000