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Utility Plant - Schedule of Utility Plant (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Utility Plant $ 591,887 $ 512,993
Transmission and distribution plant    
Property, Plant and Equipment [Line Items]    
Utility Plant 356,546 321,075
Equipment    
Property, Plant and Equipment [Line Items]    
Utility Plant 78,764 67,917
Office buildings and other structures    
Property, Plant and Equipment [Line Items]    
Utility Plant 72,564 67,313
Construction work-in-progress    
Property, Plant and Equipment [Line Items]    
Utility Plant 81,116 54,388
Land    
Property, Plant and Equipment [Line Items]    
Utility Plant $ 2,897 $ 2,300