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Nature of Operations and Basis of Presentation (Narrative) (Details) $ in Thousands		3 Months Ended				9 Months Ended
	May 02, 2022 USD ($)	Sep. 30, 2023 USD ($) earn-outArrangement	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) earn-outArrangement segment	Sep. 30, 2022 USD ($)
Long-term Purchase Commitment [Line Items]
Number of operating segments | segment						3
Gain on contract termination		$ 0			$ 0	$ 0	$ 14,000
Income from equity method investments		$ 0			2,156	0	2,156
Proceeds from the sale of private company equity units						$ 1,153	0
Cash received			$ 2,200
Estimated asset retirement obligation			1,900
Gain on the assumption of third-party asset retirement obligation			$ 300
Caddo Creek
Long-term Purchase Commitment [Line Items]
Membership interest			100.00%
Private Equity Funds
Long-term Purchase Commitment [Line Items]
Income from equity method investments					$ 2,200
HLCP Ethanol Holdco, LLC
Long-term Purchase Commitment [Line Items]
Proceeds from the sale of private company equity units				$ 18,600
Proceeds and associated gain from the post-closing purchase price adjustment, as a result of the sale of equity method investment			$ 1,200
Number of contingent earn-out arrangements | earn-outArrangement		2				2
Earn-out, project term						4 years
HLCP Ethanol Holdco, LLC | Minimum
Long-term Purchase Commitment [Line Items]
Earn-out payments		$ 0				$ 0
HLCP Ethanol Holdco, LLC | Maximum
Long-term Purchase Commitment [Line Items]
Earn-out payments		$ 12,900				$ 12,900
Coal Mining | Falkirk
Long-term Purchase Commitment [Line Items]
Total gain on contract termination							$ 30,900
Gain on contract termination	$ 14,000
Fair value gained from contract termination	4,100
Fair value of privately-held company	12,800
Investment	$ 5,000

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