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Stock-Based Compensation Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) stock_plan shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Stock compensation plans |  |  |
Number of stock incentive plans | stock_plan | 3 |  |
Vesting period | 3 years |  |
Unrecognized compensation cost | $ 400 |  |
Stock-based compensation recognized in the income statement, before taxes | 3,744 | $ 3,298 | $ 2,571
Capitalized equity-based compensation cost | $ 400 | 500 | 300
Immediate vesting for employees of certain age and above | 55 years |  |
GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 3,279 | 2,994 | 2,269
Capitalized equity-based compensation cost | 400 | 500 | 300
Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Tax benefits from exercise of stock-based awards | 900 | 800 | 900
Nonqualified stock options | GSWC |  |  |
Stock compensation plans |  |  |
Tax benefits from exercise of stock-based awards | 900 | 800 | 900
Restricted Stock Units | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 3,744 | 3,298 | 2,571
Restricted Stock Units | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 3,279 | $ 2,994 | $ 2,269
Performance awards |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
2000 and 2008 Employee Plans | Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Percentage of rights vesting in the third year from the date of grant | 34.00% |  |
2000 and 2008 Employee Plans | Restricted Stock Units |  |  |
Stock compensation plans |  |  |
Common stock entitled to be received under each award (in shares) | shares | 1 |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00% |  |
Percentage of rights vesting in the third year from the date of grant | 34.00% |  |
2000 and 2008 Employee Plans | Performance awards |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
Percentage of rights vesting in the first two years from the date of grant | 33.00% |  |
Percentage of rights vesting in the third year from the date of grant | 34.00% |  |
2003 and 2013 Directors plans |  |  |
Stock compensation plans |  |  |
Vesting period | 90 days |  |
Maximum |  |  |
Stock compensation plans |  |  |
Chang in control, term | 24 months |  |
Weighted Average |  |  |
Stock compensation plans |  |  |
Expected recognition period for unrecognized compensation cost | 1 year 6 months |  |
Weighted Average | Restricted Stock [Member] |  |  |
Stock compensation plans |  |  |
Expected recognition period for unrecognized compensation cost | 1 year 6 months 3 days |  |

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