Business Acquisitions (Pro Forma Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Net sales	$ 8,377,863	$ 8,588,978
Net income	(24,475)	$ 77,007
The Andersons Marathon Holdings LLC
Business Acquisition [Line Items]
Net sales	50,700
Net income	$ 5,100