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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | 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 |  |
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 | $ 7,500 | 9,600 |  |
Decrease in retained earnings | (647,517) | (633,496) |  |
Revenues under ASC 606 | ASC 606 Impact |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Decrease in retained earnings | $ (7,778) |  |  |
Revenues under ASC 606 | ASC 606 Impact | Rail Group |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Decrease in retained earnings |  |  |  | $ 8,400
Net Assets | Revenues under ASC 606 | Rail Group |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Increase in net assets |  |  |  | 25,600
Financing Liabilities | Revenues under ASC 606 | Rail Group |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Increase in financial liabilities and deferred tax liabilities |  |  |  | $ 34,000
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 | $ 1,900 | $ 2,500 | $ 4,900 |
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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