Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales and merchandising revenues	$ 685,579	$ 836,595	$ 2,232,720	$ 2,682,273
Income (loss) before income taxes	(3,639)	5,005	23,225	(19,630)
Total assets	2,151,618	1,964,160	2,151,618	1,964,160	$ 2,162,354
Operating Segments \| Grain
Segment Reporting Information [Line Items]
Sales and merchandising revenues	343,430	497,613	986,202	1,464,588
Income (loss) before income taxes	(8,619)	2,641	1,228	4,497
Total assets	788,770	799,655	788,770	799,655	948,871
Operating Segments \| Ethanol
Segment Reporting Information [Line Items]
Sales and merchandising revenues	194,849	191,531	568,625	533,515
Income (loss) before income taxes	9,058	6,098	17,022	12,474
Total assets	263,949	173,545	263,949	173,545	180,173
Operating Segments \| Plant Nutrient
Segment Reporting Information [Line Items]
Sales and merchandising revenues	104,188	103,620	542,911	514,943
Income (loss) before income taxes	(7,976)	(7,920)	8,239	(27,074)
Total assets	415,314	389,396	415,314	389,396	379,309
Operating Segments \| Rail
Segment Reporting Information [Line Items]
Sales and merchandising revenues	43,112	43,093	134,982	121,632
Income (loss) before income taxes	5,732	6,127	10,645	18,065
Total assets	564,227	446,884	564,227	446,884	490,448
Segment Reconciling Items
Segment Reporting Information [Line Items]
Sales and merchandising revenues	730	399	2,394	1,413
Segment Reconciling Items \| Grain
Segment Reporting Information [Line Items]
Sales and merchandising revenues	442	72	1,435	279
Segment Reconciling Items \| Plant Nutrient
Segment Reporting Information [Line Items]
Sales and merchandising revenues	0	0	0	241
Segment Reconciling Items \| Rail
Segment Reporting Information [Line Items]
Sales and merchandising revenues	288	327	959	893
Other
Segment Reporting Information [Line Items]
Sales and merchandising revenues	0	738	0	47,595
Income (loss) before income taxes	(2,057)	(2,024)	(13,734)	(27,665)
Total assets	119,358	154,680	119,358	154,680	$ 163,553
Noncontrolling interests
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ 223	$ 83	$ (175)	$ 73

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
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-SubTopic 210
-Section S99
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