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Business Segments: (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
segment
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Details of reportable segment      
Revenues $ 108,570 $ 117,060  
Operating Income (Loss) 24,365 30,329  
Interest expense, net 5,323 5,803  
Total utility plant 1,649,859 1,542,423 $ 1,626,004
Depreciation and amortization 10,114 9,560  
Income tax expense 4,461 5,914  
Property, Plant and Equipment, Additions $ 35,170 37,093  
AWR      
Details of reportable segment      
Number of reportable segments | segment 3    
GSWC      
Details of reportable segment      
Number of reportable segments | segment 1    
Revenues $ 73,906 75,029  
Operating Income (Loss) 16,999 21,059  
Total utility plant 1,523,665   $ 1,499,745
Depreciation and amortization 8,545 8,062  
Income tax expense 2,689 3,768  
GSWC | Water Service Utility Operations      
Details of reportable segment      
Revenues $ 73,906 75,029  
ASUS | Contracted Services      
Details of reportable segment      
Period of fixed price contracts to operate and maintain water systems at various military bases 50 years    
BVESI | Electric Service Utility Operations      
Details of reportable segment      
Revenues $ 11,892 11,539  
Golden State Water Company and Bear Valley Electric Service Inc.      
Details of reportable segment      
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment 94 95  
Reportable Legal Entities | GSWC | Water Service Utility Operations      
Details of reportable segment      
Revenues 73,906 75,029  
Operating Income (Loss) 16,999 21,059  
Interest expense, net 5,145 5,711  
Total utility plant 1,523,665 1,426,175  
Depreciation and amortization 8,545 8,062  
Income tax expense 2,689 3,768  
Property, Plant and Equipment, Additions 31,465 31,824  
Reportable Legal Entities | ASUS | Contracted Services      
Details of reportable segment      
Revenues 22,772 30,492  
Operating Income (Loss) 3,770 5,824  
Interest expense, net (135) (229)  
Total utility plant 19,080 21,902  
Depreciation and amortization 915 859  
Income tax expense 944 1,391  
Property, Plant and Equipment, Additions 237 487  
Reportable Legal Entities | BVESI | Electric Service Utility Operations      
Details of reportable segment      
Revenues 11,892 11,539  
Operating Income (Loss) 3,598 3,448  
Interest expense, net 113 86  
Total utility plant 107,114 94,346  
Depreciation and amortization 654 639  
Income tax expense 952 884  
Property, Plant and Equipment, Additions 3,468 4,782  
Intersegment Eliminations | AWR      
Details of reportable segment      
Revenues 0 0  
Operating Income (Loss) (2) (2)  
Interest expense, net 200 235  
Total utility plant 0 0  
Depreciation and amortization 0 0  
Income tax expense (124) (129)  
Property, Plant and Equipment, Additions $ 0 $ 0