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Business Segments 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting [Abstract]      
Total utility plant $ 1,626,004 $ 1,512,043 $ 1,415,705
Other assets 274,979 279,560  
Total Assets 1,900,983 1,791,603  
Parent Company      
Segment Reporting [Abstract]      
Total utility plant 0 0 0
Total Assets 864,144 759,716  
GSWC      
Segment Reporting [Abstract]      
Total utility plant 1,499,745 1,400,489  
Total Assets 1,638,482 1,560,782  
Segment Reporting Information [Line Items]      
Depreciation on transportation equipment 379 353 316
Contracted services: | American States Utility Services      
Segment Reporting [Abstract]      
Total utility plant $ 19,751 $ 22,246 $ 20,963