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
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