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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory assets and liabilities |  |  | $ (8,622) | $ 86,070
GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory assets and liabilities |  |  | (8,683) | 81,854
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets, contributions by employer |  |  | 2,900 |
Increase (decrease) in regulatory assets and liabilities | $ 0 | $ 27 | 0 | 211
Pension Benefits | GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory adjustment — deferred | 1,500 |  | 1,500 |
Pension Benefits | BVES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory adjustment — deferred | 600 |  | 600 |
Pension Benefits | Water: | GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (decrease) in regulatory assets and liabilities | $ (100) |  | $ (400) | $ 200

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