Revenues Contract assets and Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Contract with Customer, Asset and Liability [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3,400,000
ASUS construction	53,171	$ 56,909	$ 62,411
American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Unbilled Contracts Receivable	10,125	14,835
Government Contract Receivable	85,456	79,818
Contract assets	14,982	9,587
Contract liabilities	$ 903	$ 257
Minimum | American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	32 years
Maximum | American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	46 years
Contracted services: | American States Utility Services
Contract with Customer, Asset and Liability [Line Items]
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases	50 years