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Earnings per Share/Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Capital stock
Options outstanding (in shares)	0	0	0	0
Exercise of stock options and other issuance of Common Shares (in shares)			24,612	47,149
Other financing activities			$ (1,236)	$ (1,287)
Dividends paid			$ 41,664	$ 38,207
Common Stock, Dividends, Per Share, Cash Paid	$ 0.3975	$ 0.365	$ 1.1275	$ 1.035
Parent Company
Capital stock
Dividends paid	$ 14,700	$ 13,500	$ 41,700	$ 38,200
GSWC
Capital stock
Other financing activities			(1,134)	(1,163)
Dividends paid		13,500	$ 27,000	$ 38,300
ASUS
Capital stock
Dividends paid		$ 14,700
Restricted Stock
Capital stock
Restricted stock units outstanding (in shares)	96,629	101,267	96,629	101,267

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