Related Party Transactions (Investment Balance in Company's Equity Method Investees) (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments		$ 242,326	$ 223,239
The Andersons Albion Ethanol LLC
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments		50,382	45,024
The Andersons Clymers Ethanol LLC
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments		24,242	19,830
The Andersons Marathon Ethanol LLC
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments		14,841	12,660
Lansing Trade Group, LLC
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments		101,715	93,088
Thompsons Limited
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments	[1]	48,987	50,198
Other
Equity Method Investment Companys Investment Balance In Each Equity Method Investees By Entity [Abstract]
Equity method investments		$ 2,159	$ 2,439

[1] Thompsons Limited and related U.S. operating company held by joint ventures