Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 1,064,244	$ 1,187,704	$ 1,952,123	$ 2,105,929
Inter-segment sales	643	831	2,720	3,018
Income (loss) before income taxes	23,109	50,367	201	55,405
Identifiable assets	2,107,415	2,152,365	2,107,415	2,152,365	$ 2,359,101
Grain
Segment Reporting Information [Line Items]
Revenues from external customers	522,989	601,397	1,061,803	1,160,073
Inter-segment sales	174	440	1,625	2,129
Income (loss) before income taxes	(13,037)	3,149	(30,442)	3,892
Identifiable assets	879,055	867,655	879,055	867,655	1,010,810
Ethanol
Segment Reporting Information [Line Items]
Revenues from external customers	142,520	142,564	257,213	275,365
Income (loss) before income taxes	6,187	9,667	3,507	14,946
Identifiable assets	192,470	194,359	192,470	194,359	183,080
Plant Nutrient
Segment Reporting Information [Line Items]
Revenues from external customers	320,036	357,186	487,027	511,137
Inter-segment sales	114	148	361	465
Income (loss) before income taxes	23,535	18,873	25,239	19,297
Identifiable assets	448,225	517,586	448,225	517,586	531,753
Rail
Segment Reporting Information [Line Items]
Revenues from external customers	40,342	45,523	79,951	89,739
Inter-segment sales	355	243	734	424
Income (loss) before income taxes	6,569	21,689	15,944	32,002
Identifiable assets	388,456	395,798	388,456	395,798	405,702
Retail
Segment Reporting Information [Line Items]
Revenues from external customers	38,357	41,034	66,129	69,615
Income (loss) before income taxes	1,010	1,469	(1,066)	(714)
Identifiable assets	43,878	45,194	43,878	45,194	44,135
Other
Segment Reporting Information [Line Items]
Income (loss) before income taxes	(2,173)	(5,786)	(13,073)	(15,173)
Identifiable assets	155,331	131,773	155,331	131,773	$ 183,621
Noncontrolling Interests
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ 1,018	$ 1,306	$ 92	$ 1,155

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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