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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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