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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 35,863 | $ 5,713
GSWC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 34,059 | 5,135
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contributions in current fiscal year | 3,000 |
Increase (Decrease) in Regulatory Assets and Liabilities | 92 | $ 0
Pension Benefits | GSWC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory adjustment — deferred | (1,227) |
Pension Benefits | BVES |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory adjustment — deferred | (574) |
Pension Benefits | Water: | GSWC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (92) |

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