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Long-Term Debt 3 (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 13, 2023
Debt Instrument [Line Items] |  |  |  |
Ratio of Indebtedness to EBITDA | 8 |  |  |
Loan proceeds received for reimbursement of costs of conversion | $ 34,789 | $ 0 | $ 159,413 |
3.45% notes due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 3.45% | 3.45% |  |
GSWC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Ratio of Indebtedness to EBITDA | 4.2 |  |  |
Maximum borrowing capacity | $ 130,000 |  |  |
Loan proceeds received for reimbursement of costs of conversion | $ 0 | $ 0 | $ 159,413 |
GSWC | 3.45% notes due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) | 3.45% | 3.45% |  |
GSWC | Series A Senior Notes 5.12 Percent Due 2033 | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 100,000
Interest rate (as a percent) |  |  |  | 5.12%

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