Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues from external customers	$ 935,774	$ 952,927	$ 3,094,355	$ 3,268,303
Inter-segment sales	845	1,045	3,864	5,103
Income (loss) before income taxes	(2,455)	29,530	52,950	144,515
Identifiable assets	2,191,694	2,082,992	2,191,694	2,082,992	$ 2,364,692
Grain
Segment Reporting Information [Line Items]
Revenues from external customers	570,626	575,354	1,781,104	1,814,517
Inter-segment sales	404	894	2,534	4,256
Income (loss) before income taxes	131	12,449	4,024	34,110
Identifiable assets	852,388	713,352	852,388	713,352	1,137,437
Ethanol
Segment Reporting Information [Line Items]
Revenues from external customers	139,140	179,405	416,752	594,613
Income (loss) before income taxes	5,888	21,253	20,833	74,981
Identifiable assets	186,250	257,194	186,250	257,194	197,888
Plant Nutrient
Segment Reporting Information [Line Items]
Revenues from external customers	149,303	133,440	660,440	639,603
Inter-segment sales	53	42	517	520
Income (loss) before income taxes	(11,114)	(3,014)	8,183	23,952
Identifiable assets	546,673	336,887	546,673	336,887	433,013
Rail
Segment Reporting Information [Line Items]
Revenues from external customers	44,758	32,022	134,497	117,733
Inter-segment sales	388	109	813	327
Income (loss) before income taxes	11,913	4,160	43,915	25,889
Identifiable assets	413,955	316,851	413,955	316,851	365,531
Retail
Segment Reporting Information [Line Items]
Revenues from external customers	31,947	32,706	101,562	101,837
Income (loss) before income taxes	(769)	(968)	(1,483)	(1,666)
Identifiable assets	45,403	46,108	45,403	46,108	44,536
Other
Segment Reporting Information [Line Items]
Income (loss) before income taxes	(8,781)	(6,804)	(23,955)	(23,595)
Identifiable assets	147,025	412,600	147,025	412,600	$ 186,287
Noncontrolling Interests
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ 277	$ 2,454	$ 1,433	$ 10,844

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.

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