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Business Acquisitions (Intangible Assets Acquired) (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  | $ 135,360 |  | $ 6,024 | $ 6,024 | $ 63,934
LTG |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 126,610 |  |  |  |  |
Other intangible assets | $ 112,900 |  |  |  |  |
Estimated useful life | 8 years |  |  |  |  |
LTG | Customer relationships |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets | $ 92,400 |  |  |  |  |
Estimated useful life | 10 years |  |  |  |  |
LTG | Non-compete agreements |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets | $ 20,500 |  |  |  |  |
Estimated useful life | 3 years |  |  |  |  |
The Andersons Marathon Holdings LLC |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 2,726 |  |  |

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