Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Goodwill, Impairment Loss			$ 24,091
Goodwill	$ 29,132	[1]	10,598	[1]	$ 34,689
Fluid Quip Technologies, LLC [Member]
Finite-lived Intangible Assets Acquired	22,800
Finite-Lived Intangible Assets, Accumulated Amortization	$ 5,900
Finite-Lived Intangible Assets, Remaining Amortization Period	11 years 6 months
Amortization of Intangible Assets	$ 5,700
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	4,800
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2,800
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,500
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,200
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2,000
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	8,500
Fluid Quip Technologies, LLC [Member] | Customer Relationships [Member]
Finite-lived Intangible Assets Acquired	17,700
Fluid Quip Technologies, LLC [Member] | Intellectual Property [Member]
Finite-lived Intangible Assets Acquired	9,700
Fluid Quip Technologies, LLC [Member] | Trade Names [Member]
Finite-lived Intangible Assets Acquired	1,300
Ethanol Production [Member]
Goodwill, Impairment Loss			24,091
Goodwill	18,534	[1]		[1]	24,091
Partnership [Member]
Goodwill, Impairment Loss
Goodwill	$ 10,598	[1]	$ 10,598	[1]	$ 10,598

[1] The company records goodwill within other assets on the consolidated balance sheets.