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Stock-Based Compensation Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) stock_plan shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Stock compensation plans |  |  |
Number of stock incentive plans | stock_plan | 5 |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,885 | $ 2,538 | $ 2,754
Tax benefits from exercise of stock-based awards | $ 0 | 581 | 877
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 | $ 2,420 | 2,118 | 2,443
Capitalized equity-based compensation cost | 195 | 155 | 369
Tax benefits from exercise of stock-based awards | 0 | 501 | 872
Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Tax benefits from exercise of stock-based awards | $ 1,000 | $ 581 | $ 877
Granted (in shares) | shares | 0 | 0 | 0
Nonqualified stock options | GSWC |  |  |
Stock compensation plans |  |  |
Tax benefits from exercise of stock-based awards | $ 1,000 | $ 501 | $ 872
Restricted Stock Units | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 2,885 | 2,538 | 2,754
Restricted Stock Units | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,420 | $ 2,118 | $ 2,443
Performance awards |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
2000 and 2008 Employee Plans | Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
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% |  |
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% |  |
Weighted Average [Member] |  |  |
Stock compensation plans |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 6 months 30 days |  |
Weighted Average [Member] | Restricted Stock Units |  |  |
Stock compensation plans |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 4 months 10 days |  |

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- Definition Period in which 33% vesting rights is earned by awardeed of the grant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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