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10. Commitments and Contingencies (Details) - Legal Proceedings - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Estimated Litigation Liability [Line Items]            
Litigation loss $ 0 $ 0   $ 430 $ 35,590  
Accrued litigation 21,800     21,800   $ 21,800
Insurance receivable for accrued litigation 21,800     21,800   21,800
Southern Power Company Arbitration [Member]            
Estimated Litigation Liability [Line Items]            
Litigation loss           $ 35,600
Subcontractor Workplace Injury [Member]            
Estimated Litigation Liability [Line Items]            
Litigation Settlement, Amount Awarded to Other Party   $ 21,800 $ 51,300      
Accrued litigation 21,800     21,800    
Insurance receivable for accrued litigation $ 21,800     $ 21,800