Goodwill and Other Intangible Assets (Changes in Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill at beginning of period	$ 135,360	$ 6,024	$ 6,024
Goodwill, Transfers	0
Acquisitions	349	129,336	0
Impairments	0	0	0
Goodwill at end of period	135,709	135,360	6,024
Trade
Goodwill [Roll Forward]
Goodwill at beginning of period	127,781	1,171	1,171
Goodwill, Transfers	(5,714)
Acquisitions	0	126,610	0
Impairments	0	0	0
Goodwill at end of period	122,067	127,781	1,171
Plant Nutrient
Goodwill [Roll Forward]
Goodwill at beginning of period	686	686	686
Goodwill, Transfers	0
Acquisitions	0	0	0
Impairments	0	0	0
Goodwill at end of period	686	686	686
Rail
Goodwill [Roll Forward]
Goodwill at beginning of period	4,167	4,167	4,167
Goodwill, Transfers	0
Acquisitions	0	0	0
Impairments	0	0	0
Goodwill at end of period	4,167	4,167	4,167
Ethanol
Goodwill [Roll Forward]
Goodwill at beginning of period	2,726	0	0
Goodwill, Transfers	5,714
Acquisitions	349	2,726	0
Impairments	0	0	0
Goodwill at end of period	$ 8,789	$ 2,726	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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