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Stock-Based Compensation Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) stock_plan shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares
Stock compensation plans |  |  |
Number of stock incentive plans | stock_plan | 4 |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,754 | $ 2,222 | $ 2,009
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 | $ 2,443 | 1,748 | 1,647
Capitalized equity-based compensation cost | $ 369 | $ 255 | $ 334
Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Granted (in shares) | shares | 0 | 0 | 0
Nonqualified stock options | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 0 | $ 0 | $ 9
Nonqualified stock options | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 0 | 0 | 8
Restricted Stock Units | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | 2,754 | 2,222 | 2,000
Restricted Stock Units | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,443 | $ 1,748 | $ 1,639
Performance awards |  |  |
Stock compensation plans |  |  |
Vesting period | 3 years |  |
2000 and 2008 Employee Plans | Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Expiration term | 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 |  |  |
Vesting period | 3 years |  |
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 Directors Plan | Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Expiration term | 10 years |  |
Vesting period | 3 years |  |

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