Note 14. Commitments and Contingencies (Details) - Legal Proceedings - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Estimated Litigation Liability [Line Items]
Litigation loss			$ 0	$ 430	$ 35,590
Accrued litigation			21,800	21,800
Insurance receivable for accrued litigation			21,800	$ 21,800
Southern Power Company Arbitration
Estimated Litigation Liability [Line Items]
Litigation loss					$ 35,600
Other Matters and Claims - Workplace Injury
Estimated Litigation Liability [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 21,800	$ 51,300
Accrued litigation			21,800
Insurance receivable for accrued litigation			$ 21,800