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Stock-Based Compensation Plans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) stock_plan shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Stock compensation plans
Number of stock incentive plans | stock_plan	5
Stock-based compensation recognized in the income statement, before taxes	$ 3,851	$ 2,885	$ 2,538
Tax benefits from exercise of stock-based awards	$ 0	0	581
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	$ 3,397	2,420	2,118
Capitalized equity-based compensation cost	199	195	155
Tax benefits from exercise of stock-based awards	0	0	501
Nonqualified stock options
Stock compensation plans
Tax benefits from exercise of stock-based awards	$ 1,600	$ 1,024	$ 581
Granted (in shares) | shares	0	0	0
Nonqualified stock options | GSWC
Stock compensation plans
Tax benefits from exercise of stock-based awards	$ 1,600	$ 1,012	$ 501
Restricted Stock Units | Employees and directors
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	3,851	2,885	2,538
Restricted Stock Units | Employees and directors | GSWC
Stock compensation plans
Stock-based compensation recognized in the income statement, before taxes	$ 3,397	$ 2,420	$ 2,118
Performance awards
Stock compensation plans
Vesting period	3 years
2000 Plan [Member] | Nonqualified stock options
Stock compensation plans
Granted (in shares) | shares	0
2000 and 2008 Employee Plans | Nonqualified stock options
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%
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%
Maximum
Stock compensation plans
Chang in control, term	P24M
Weighted Average [Member]
Stock compensation plans
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 63 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 38 days

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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