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Stock-Based Compensation Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) stock_plan shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares
Stock compensation plans |  |  |
Number of stock incentive plans | stock_plan | 5 |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,538 | $ 2,754 | $ 2,222
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 | $ 2,118 | 2,443 | 1,748
Capitalized equity-based compensation cost | $ 155 | $ 369 | $ 255
Nonqualified stock options |  |  |
Stock compensation plans |  |  |
Granted (in shares) | shares | 0 | 0 | 0
Restricted Stock Units | Employees and directors |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,538 | $ 2,754 | $ 2,222
Restricted Stock Units | Employees and directors | GSWC |  |  |
Stock compensation plans |  |  |
Stock-based compensation recognized in the income statement, before taxes | $ 2,118 | $ 2,443 | $ 1,748
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 |  |
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 10 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 5 months 2 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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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