v3.26.1
Fair Value Measurements - Schedule of Costs and Fair Values of Investments in Debt Securities Held in Decommissioning Trust Fund (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Cost    
Less than 5 years $ 35,408 $ 23,565
5 years to 10 years 0 0
Due after 10 years 0 0
Total 35,408 23,565
Estimated Fair Value    
Less than 5 years 35,462 23,707
5 years to 10 years 0 0
Due after 10 years 0 0
Total $ 35,462 $ 23,707