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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | $ 86,070 | $ 14,065
GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | 81,854 | 12,549
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 2,900 |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 27 | $ 0 | 211 | 0
Pension Benefits | GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory adjustment — deferred | (1,138) |  | (1,138) |
Pension Benefits | BVES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory adjustment — deferred | $ (205) |  | $ (205) |
Pension Benefits | Water: | GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  | $ 27 |  | $ 211

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