STATEMENTS OF CHANGES IN COMMON SHAREHOLDER'S EQUITY - 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, 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
Issuances of Common Shares from an at-the-market program, net of issuance costs				1	1
Issuances of Common Shares under stock-based compensation plans	14,043	14,000
Issuance of common share				$ 10,000	$ 10,000
Issuance of Common Shares under stock-based compensation plans	$ 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
Beginning Balance (in shares) at Dec. 31, 2023		36,981,000			171
Beginning balances at Dec. 31, 2023	776,109	$ 263,179	512,930	703,828	$ 370,909	332,919
Add:
Net income	$ 23,135		23,135	17,794		17,794
Issuances of Common Shares from an at-the-market program, net of issuance costs		228,000
Issuances of Common Shares under stock-based compensation plans	20,290	20,000
Issuance of common share	$ 15,584	$ 15,584
Issuance of Common Shares under stock-based compensation plans	0	0
Stock-based compensation, net of taxes paid from shares withheld from employees related to net share settlements (Note 4)	1,570	1,570		1,561	1,561
Dividend equivalent rights on stock-based awards not paid in cash	44	$ 44		41	$ 41
Deduct:
Dividends on Common Shares	15,905		15,905
Dividend equivalent rights on stock-based awards not paid in cash	44		44	41		41
Ending Balances (in shares) at Mar. 31, 2024		37,229,000			171
Ending balances at Mar. 31, 2024	$ 800,493	$ 280,377	$ 520,116	$ 723,183	$ 372,511	$ 350,672