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Business Segments: (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Details of reportable segment      
Revenues $ 117,060 $ 109,077  
Operating income (loss) 30,329 25,699  
Interest expense, net (5,803) (5,492)  
Net property, plant and equipment 1,542,423 1,432,397 $ 1,512,043
Depreciation and amortization 9,560 8,811  
Income tax expense 5,914 3,901  
Capital additions $ 37,093 33,544  
AWR      
Details of reportable segment      
Number of reportable segments | segment 3    
GOLDEN STATE WATER COMPANY      
Details of reportable segment      
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment   82  
Number of reportable segments | segment 2    
Revenues $ 75,029 82,392  
Operating income (loss) 21,059 22,092  
Net property, plant and equipment 1,426,175   $ 1,400,489
Depreciation and amortization 8,062 8,029  
Income tax expense 3,768 3,228  
GOLDEN STATE WATER COMPANY | Water Service Utility Operations      
Details of reportable segment      
Revenues $ 75,029 71,424  
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations      
Details of reportable segment      
Revenues   10,968  
ASUS | Contracted Services      
Details of reportable segment      
Period of fixed price contracts to operate and maintain water systems at various military bases 50 years    
Bear Valley Electric Service, Inc. | Electric Service Utility Operations      
Details of reportable segment      
Revenues $ 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 95    
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Water Service Utility Operations      
Details of reportable segment      
Revenues 75,029 71,424  
Operating income (loss) 21,059 18,605  
Interest expense, net (5,711) (5,133)  
Net property, plant and equipment 1,426,175 1,336,012  
Depreciation and amortization 8,062 7,422  
Income tax expense 3,768 2,378  
Capital additions 31,824 28,459  
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations      
Details of reportable segment      
Revenues   10,968  
Operating income (loss)   3,487  
Interest expense, net   (326)  
Net property, plant and equipment   74,745  
Depreciation and amortization   607  
Income tax expense   850  
Capital additions   3,554  
Reportable Legal Entities | ASUS | Contracted Services      
Details of reportable segment      
Revenues 30,492 26,685  
Operating income (loss) 5,824 3,609  
Interest expense, net 229 (77)  
Net property, plant and equipment 21,902 21,640  
Depreciation and amortization 859 782  
Income tax expense 1,391 748  
Capital additions 487 1,531  
Reportable Legal Entities | Bear Valley Electric Service, Inc. | Electric Service Utility Operations      
Details of reportable segment      
Revenues 11,539    
Operating income (loss) 3,448    
Interest expense, net (86)    
Net property, plant and equipment 94,346    
Depreciation and amortization 639    
Income tax expense 884    
Capital additions 4,782    
Intersegment Eliminations | AWR      
Details of reportable segment      
Revenues 0 0  
Operating income (loss) (2) (2)  
Interest expense, net 235 110  
Net property, plant and equipment 0 0  
Depreciation and amortization 0 0  
Income tax expense (129) (75)  
Capital additions $ 0 $ 0