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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | $ 3,001 | $ 70,875
GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  | 3,602 | 68,016
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 | $ 0 | $ 92 | 0 | 184
Pension Benefits | GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory adjustment — deferred | (1,400) |  | (1,400) |
Pension Benefits | BVES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Regulatory adjustment — deferred | (500) |  | (500) |
Pension Benefits | Water: | GSWC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 100 | $ (100) | $ 300 | $ (200)

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