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Regulatory Matters - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jan. 30, 2024
Regulatory Liabilities [Line Items] |  |  |  |  |
Other income (note 5) | $ 6,030 | $ 8,850 | $ 12,729 | $ 17,901 |
Mountain View Fire |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Accrued estimated losses | 172,282 |  | 172,282 |  |
Expenses of wildlife memerandum account |  |  | 56,282 |  |
Empire Electric | Midwest Extreme Weather Event |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Issuance of securitized bonds for qualified extraordinary costs |  |  |  |  | $ 301,463
Amortization expense | $ 5,970 |  | $ 8,046 |  |

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