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Earnings per Share/Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Capital stock
Options outstanding (in shares)	0	0	0	0
Exercise of stock options and other issuance of Common Shares (in shares)			19,742	42,668
Payment, Tax Withholding, Share-based Payment Arrangement			$ (1,205)	$ (1,271)
Dividends paid			$ 26,974	$ 24,727
Common Stock, Dividends, Per Share, Cash Paid	$ 0.365	$ 0.335	$ 0.730	$ 0.670
Parent Company
Capital stock
Dividends paid	$ 13,500	$ 12,400	$ 27,000	$ 24,700
GSWC
Capital stock
Payment, Tax Withholding, Share-based Payment Arrangement			(1,103)	(1,155)
Dividends paid	$ 13,500	$ 12,400	$ 27,000	$ 24,800
Restricted Stock
Capital stock
Restricted stock units outstanding (in shares)	100,820	107,772	100,820	107,772

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