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Revenues Contract assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Contract with Customer, Asset and Liability [Line Items]    
Revenue, Remaining Performance Obligation, Amount $ 4,100,000  
American States Utility Services    
Contract with Customer, Asset and Liability [Line Items]    
Unbilled Contracts Receivable 10,910 $ 9,693
Government Contract Receivable 76,486 91,489
Contract assets 21,648 14,378
Contract liabilities $ 5,662 $ 1,352
Minimum | American States Utility Services    
Contract with Customer, Asset and Liability [Line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 14 years  
Maximum | American States Utility Services    
Contract with Customer, Asset and Liability [Line Items]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 49 years