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Stock-Based Compensation Plans (Details) $ in Thousands	12 Months Ended
	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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Represents the common stock entitled to be received under each share-based payment award.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in the third year from the date of grant, thereby giving the employee the legal right to convert the award to shares, expressed as a percentage.

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+ 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

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-Topic 718
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-Paragraph 1
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross number of share options (or share units) granted during the period.

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