CONSOLIDATED STATEMENTS OF CHANGES IN COMMON SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Shares	Reinvested Earnings in the Business	GOLDEN STATE WATER COMPANY	GOLDEN STATE WATER COMPANY Common Shares	GOLDEN STATE WATER COMPANY Reinvested Earnings in the Business
Beginning Balance (in shares) at Dec. 31, 2021		36,936,000			170
Beginning balances at Dec. 31, 2021	$ 685,947	$ 258,442	$ 427,505	$ 615,686	$ 356,530	$ 259,156
Add:
Net income	$ 14,162		14,162	8,567		8,567
Exercise of stock options and other issuances of Common Shares (in shares)	19,348	20,000
Exercise of stock options and other issuances of Common Shares	$ 0	$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	801	801		742	742
Dividend equivalent rights on stock-based awards not paid in cash	41	$ 41		39	$ 39
Deduct:
Dividends on Common Shares	13,485		13,485	13,500		13,500
Dividend equivalent rights on stock-based awards not paid in cash	41		41	39		39
Ending Balances (in shares) at Mar. 31, 2022		36,956,000			170
Ending balances at Mar. 31, 2022	687,425	$ 259,284	428,141	611,495	$ 357,311	254,184
Beginning Balance (in shares) at Dec. 31, 2022		36,962,000			170
Beginning balances at Dec. 31, 2022	709,549	$ 260,158	449,391	643,906	$ 358,123	285,783
Add:
Net income	$ 34,407		34,407	27,463		27,463
Exercise of stock options and other issuances of Common Shares (in shares)				$ 10,000	$ 10,000
Exercise of stock options and other issuances of Common Shares (in shares)	14,043	14,000		1	1
Exercise of stock options and other issuances of Common Shares	$ 0	$ 0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	1,587	1,587		$ 1,603	$ 1,603
Dividend equivalent rights on stock-based awards not paid in cash	47	$ 47		44	$ 44
Deduct:
Dividends on Common Shares	14,695		14,695	24,700		24,700
Dividend equivalent rights on stock-based awards not paid in cash	47		47	44		44
Ending Balances (in shares) at Mar. 31, 2023		36,976,000			171
Ending balances at Mar. 31, 2023	$ 730,848	$ 261,792	$ 469,056	$ 658,272	$ 369,770	$ 288,502