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Stock-Based Compensation Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) stock_plan shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Stock compensation plans |  |  |
Number of stock incentive plans | stock_plan | 3 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 122 |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,463 | $ 2,517 | $ 3,851
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 | $ 2,349 | 2,253 | 3,397
Capitalized equity-based compensation cost | 299 | 265 | 199
Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Tax benefits from exercise of stock-based awards | 1,200 | 1,800 | 1,600
Nonqualified stock options | GSWC |  |  |
Stock compensation plans |  |  |
Tax benefits from exercise of stock-based awards | 1,200 | 1,800 | 1,600
Restricted Stock Units | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 2,463 | 2,517 | 3,851
Restricted Stock Units | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,349 | $ 2,253 | $ 3,397
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 | 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 [Member] |  |  |
Stock compensation plans |  |  |
Vesting period | 90 days |  |
Maximum |  |  |
Stock compensation plans |  |  |
Chang in control, term | 24 |  |
Weighted Average [Member] |  |  |
Stock compensation plans |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 10 months 28 days |  |
Weighted Average [Member] | Restricted Stock [Member] |  |  |
Stock compensation plans |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 2 months 15 days |  |

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