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Business Segments: (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Details of reportable segment      
Total operating revenues $ 109,077 $ 101,733  
Operating income (loss) 25,699 20,195  
Interest expense, net 5,492 5,375  
Utility plant 1,432,397 1,325,502 $ 1,415,705
Depreciation and amortization expense 8,811 10,832  
Income tax expense (benefit) 3,901 3,310  
Capital additions $ 33,544 40,562  
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 58  
Number of reportable segments | segment 2    
Total operating revenues $ 82,392 75,352  
Operating income (loss) 22,092 15,327  
Utility plant 1,410,757   $ 1,394,742
Depreciation and amortization expense 8,029 9,989  
Income tax expense (benefit) 3,228 2,120  
GOLDEN STATE WATER COMPANY | Water Service Utility Operations      
Details of reportable segment      
Total operating revenues 71,424 64,723  
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations      
Details of reportable segment      
Total operating revenues $ 10,968 10,629  
ASUS | Contracted Services      
Details of reportable segment      
Period of fixed price contracts to operate and maintain water systems at various military bases 50 years    
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Water Service Utility Operations      
Details of reportable segment      
Total operating revenues $ 71,424 64,723  
Operating income (loss) 18,605 13,266  
Interest expense, net 5,133 5,237  
Utility plant 1,336,012 1,247,080  
Depreciation and amortization expense 7,422 9,389  
Income tax expense (benefit) 2,378 1,673  
Capital additions 28,459 38,379  
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations      
Details of reportable segment      
Total operating revenues 10,968 10,629  
Operating income (loss) 3,487 2,061  
Interest expense, net 326 353  
Utility plant 74,745 62,584  
Depreciation and amortization expense 607 600  
Income tax expense (benefit) 850 447  
Capital additions 3,554 734  
Reportable Legal Entities | ASUS | Contracted Services      
Details of reportable segment      
Total operating revenues 26,685 26,381  
Operating income (loss) 3,609 4,870  
Interest expense, net (77) 361  
Utility plant 21,640 15,838  
Depreciation and amortization expense 782 843  
Income tax expense (benefit) 748 1,125  
Capital additions 1,531 1,449  
Intersegment Eliminations | AWR      
Details of reportable segment      
Total operating revenues 0 0  
Operating income (loss) (2) (2)  
Interest expense, net 110 (146)  
Utility plant 0 0  
Depreciation and amortization expense 0 0  
Income tax expense (benefit) (75) 65  
Capital additions $ 0 $ 0