Goodwill (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) item
Number of reporting units \| item		2
Goodwill, Impairment Loss		$ 24,091
Ethanol Production [Member]
Goodwill, Impairment Loss		24,091
Partnership [Member]
Goodwill, Impairment Loss

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration