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Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
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 balance payable | $ 5.8 | $ 4.5 |
Property subject to or available for leases statutory life minimum | 40 years |  |
Property subject to or available for leases statutory life maximum | 50 years |  |
Amortization of capitalized computer software costs | $ 7.1 | 6.5 | $ 3.8
Unamortized computer software | 47.2 | 52.2 |
Accrued compensation liability | $ 9.7 | 11.1 |
Stock split, conversion ratio | 1.5 |  |
Minimum |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Intangible assets estimated useful life | 3 years |  |
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 | $ 4.9 | $ 5.2 | $ 4.5
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 |  |

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