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Business Segments: (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Details of reportable segment      
Total operating revenues $ 101,733 $ 94,728  
Operating income (loss) 20,195 18,691  
Interest expense, net 5,375 5,387  
Utility plant 1,325,502 1,218,830 $ 1,296,310
Depreciation and amortization expense 10,832 9,666  
Income tax expense 3,310 2,564  
Capital additions $ 40,562 30,364  
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 $ 58 60  
Number of reportable segments | segment 2    
Total operating revenues $ 75,352 74,244  
Operating income (loss) 15,327 16,297  
Utility plant 1,309,664   $ 1,281,092
Depreciation and amortization expense 9,989 9,334  
Income tax expense $ 2,120 2,115  
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 $ 64,723 64,412  
Operating income (loss) 13,266 14,058  
Interest expense, net 5,237 5,009  
Utility plant 1,247,080 1,149,038  
Depreciation and amortization expense 9,389 8,769  
Income tax expense 1,673 1,649  
Capital additions 38,379 26,618  
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations      
Details of reportable segment      
Total operating revenues 10,629 9,832  
Operating income (loss) 2,061 2,239  
Interest expense, net 353 370  
Utility plant 62,584 60,261  
Depreciation and amortization expense 600 565  
Income tax expense 447 466  
Capital additions 734 974  
Reportable Legal Entities | ASUS | Contracted Services      
Details of reportable segment      
Total operating revenues 26,381 20,484  
Operating income (loss) 4,870 2,397  
Interest expense, net (361) 66  
Utility plant 15,838 9,531  
Depreciation and amortization expense 843 332  
Income tax expense 1,125 554  
Capital additions 1,449 2,772  
Intersegment Eliminations | AWR      
Details of reportable segment      
Total operating revenues 0 0  
Operating income (loss) (2) (3)  
Interest expense, net 146 (74)  
Utility plant 0 0  
Depreciation and amortization expense 0 0  
Income tax expense 65 (105)  
Capital additions $ 0 $ 0