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Earnings Per Share / Capital Stock- Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Additional disclosure |  |  |
Exercise of stock options and other issuance of Common Shares | 18,371 | 25,956 | 47,182
Proceeds from Stock Options Exercised, Distributed to Subsidiaries | $ 0 | $ 0 | $ 0
Dividend Reinvestment Plan Common Stock Capital Shares Reserved for Future Issuance | 1,055,948 |  |
Common Shares authorized for issuance but unissued under 401(k) Plan | 387,300 |  |
GSWC |  |  |
Additional disclosure |  |  |
Exercise of stock options and other issuance of Common Shares | 1 | 0 | 0
Stock Issued During Period, Value, New Issues | $ 10,000,000 |  |

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