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Revenues Contract assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Contract with Customer, Asset and Liability [Line Items]        
Contract with Customer, Liability, Revenue Recognized     $ 3,700  
Revenue, Remaining Performance Obligation     0  
American States Utility Services [Member]        
Contract with Customer, Asset and Liability [Line Items]        
Government Contract Receivable     61,126 $ 40,150
Contract assets     24,447 30,388
Contract liabilities     $ 7,530 $ 3,911
Minimum | American States Utility Services [Member]        
Contract with Customer, Asset and Liability [Line Items]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period     36 years  
Maximum [Member] | American States Utility Services [Member]        
Contract with Customer, Asset and Liability [Line Items]        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   50 years    
Contracted Services [Member] | American States Utility Services [Member]        
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   50 years