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Nature of Operations and Basis of Presentation (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
May 02, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Long-term Purchase Commitment [Line Items]              
Number of operating segments | segment           3  
Gain on contract termination   $ 0     $ 14,000 $ 0 $ 14,000
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%        
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 | segment   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