Utility Plant - Utility Plant (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Utility Plant	$ 610,766	$ 515,358
Transmission and distribution plant
Property, Plant and Equipment [Line Items]
Utility Plant	364,270	321,075
Equipment
Property, Plant and Equipment [Line Items]
Utility Plant	102,700	67,917
Office buildings and other structures
Property, Plant and Equipment [Line Items]
Utility Plant	88,529	67,313
Construction work-in-progress
Property, Plant and Equipment [Line Items]
Utility Plant	48,801	54,388
Intangible plant
Property, Plant and Equipment [Line Items]
Utility Plant	3,569	2,365
Land
Property, Plant and Equipment [Line Items]
Utility Plant	$ 2,897	$ 2,300