Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues from external customers	$ 1,922,233	$ 1,982,755	$ 5,665,519	$ 6,284,588
Income (loss) before income taxes attributable to the Company	(5,772)	(11,449)	(26,659)	10,001
Net income (loss) attributable to the noncontrolling interests	3,273	(1,633)	(20,583)	(2,265)
Income (loss) before income taxes	(2,499)	(13,082)	(47,242)	7,736
Total assets	3,411,611	3,284,452	3,411,611	3,284,452	$ 3,900,741
Operating Segments | Trade
Segment Reporting Information [Line Items]
Revenues from external customers	1,432,922	1,515,107	4,162,130	4,753,375
Income (loss) before income taxes attributable to the Company	5,941	(2,122)	(3,650)	2,610
Total assets	1,642,220	1,712,350	1,642,220	1,712,350	2,012,060
Operating Segments | Ethanol
Segment Reporting Information [Line Items]
Revenues from external customers	349,957	319,105	886,742	899,137
Income (loss) before income taxes attributable to the Company	1,148	1,070	(21,960)	7,827
Total assets	625,587	372,663	625,587	372,663	690,548
Operating Segments | Plant Nutrient
Segment Reporting Information [Line Items]
Revenues from external customers	102,707	109,446	507,445	508,548
Income (loss) before income taxes attributable to the Company	(5,387)	(7,440)	12,828	4,534
Total assets	343,121	376,615	343,121	376,615	383,781
Operating Segments | Rail
Segment Reporting Information [Line Items]
Revenues from external customers	36,647	39,097	109,202	123,528
Income (loss) before income taxes attributable to the Company	(139)	3,137	3,474	10,629
Total assets	641,797	679,056	641,797	679,056	693,931
Other
Segment Reporting Information [Line Items]
Income (loss) before income taxes attributable to the Company	(7,335)	(6,094)	(17,351)	(15,599)
Total assets	$ 158,886	$ 143,768	$ 158,886	$ 143,768	$ 120,421