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Related Party Transactions (Investment Balance in Company's Equity Method Investees) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Jul. 31, 2013
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Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | $ 23,857 |  | $ 242,326 |
The Andersons Albion Ethanol LLC (a) |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | 0 |  | 50,382 |
Percentage of company ownership interest (percentage) |  | 55.00% |  |
The Andersons Clymers Ethanol LLC (a) |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | 0 |  | 24,242 |
Percentage of company ownership interest (percentage) |  | 39.00% |  |
The Andersons Marathon Ethanol LLC (a) |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | $ 0 |  | 14,841 |
Percentage of company ownership interest (percentage) | 33.00% | 33.00% |  |
Lansing Trade Group, LLC (b) |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | $ 0 |  | $ 101,715 |
Percentage of company ownership interest (percentage) |  |  | 32.50% |
Thompsons Limited |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | 0 |  | $ 48,987 |
Percentage of company ownership interest (percentage) |  |  |  | 50.00%
Providence Grain |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | $ 12,424 |  | 0 |
Percentage of company ownership interest (percentage) | 37.80% |  |  |
Quadra Commodities S.A. |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | $ 5,574 |  | 0 |
Percentage of company ownership interest (percentage) |  | 17.70% |  |
Other |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Equity method investments | $ 5,859 |  | $ 2,159 |
Maximum | Other |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Percentage of company ownership interest (percentage) |  | 52.00% |  |
Minimum | Other |  |  |  |
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract] |  |  |  |
Percentage of company ownership interest (percentage) |  | 5.00% |  |

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