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Business Segments: (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Details of reportable segment          
Total operating revenues $ 134,496 $ 124,182 $ 360,876 $ 325,811  
Operating income (loss) 42,724 33,975 102,349 78,234  
Interest expense, net 5,453 5,307 16,234 16,106  
Utility plant 1,378,366 1,262,915 1,378,366 1,262,915 $ 1,296,310
Depreciation and amortization expense 9,006 10,118 26,493 29,794  
Income tax expense (benefit) 9,405 6,939 20,546 13,890  
Capital additions 29,933 28,546 $ 111,088 87,328  
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 80 58 $ 234 179  
Number of reportable segments | segment     2    
Total operating revenues 107,245 95,564 $ 278,145 254,382  
Operating income (loss) 36,982 27,540 86,346 66,482  
Utility plant 1,358,830   1,358,830   $ 1,281,092
Depreciation and amortization expense 8,359 9,623 24,354 28,387  
Income tax expense (benefit) 8,383 5,414 17,329 11,743  
GOLDEN STATE WATER COMPANY | Water Service Utility Operations          
Details of reportable segment          
Total operating revenues 95,249 87,689 248,112 228,834  
GOLDEN STATE WATER COMPANY | Electric Service Utility Operations          
Details of reportable segment          
Total operating revenues 11,996 7,875 $ 30,033 25,548  
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 95,249 87,689 $ 248,112 228,834  
Operating income (loss) 31,310 26,710 77,835 62,012  
Interest expense, net 5,206 5,039 15,555 15,095  
Utility plant 1,291,928 1,187,786 1,291,928 1,187,786  
Depreciation and amortization expense 7,690 9,058 22,484 26,693  
Income tax expense (benefit) 6,720 5,247 15,205 10,805  
Capital additions 25,267 24,590 99,939 75,976  
Reportable Legal Entities | GOLDEN STATE WATER COMPANY | Electric Service Utility Operations          
Details of reportable segment          
Total operating revenues 11,996 7,875 30,033 25,548  
Operating income (loss) 5,672 830 8,511 4,470  
Interest expense, net 234 291 933 1,014  
Utility plant 66,902 61,404 66,902 61,404  
Depreciation and amortization expense 669 565 1,870 1,694  
Income tax expense (benefit) 1,663 167 2,124 938  
Capital additions 2,864 1,140 4,852 3,264  
Reportable Legal Entities | ASUS | Contracted Services          
Details of reportable segment          
Total operating revenues 27,251 28,618 82,731 71,429  
Operating income (loss) 5,745 6,437 16,010 11,759  
Interest expense, net (144) 118 (724) 255  
Utility plant 19,536 13,725 19,536 13,725  
Depreciation and amortization expense 647 495 2,139 1,407  
Income tax expense (benefit) 1,391 1,606 3,816 2,865  
Capital additions 1,802 2,816 6,297 8,088  
Intersegment Eliminations | AWR          
Details of reportable segment          
Total operating revenues 0 0 0 0  
Operating income (loss) (3) (2) (7) (7)  
Interest expense, net 157 (95) 470 (252)  
Utility plant 0 0 0 0  
Depreciation and amortization expense 0 0 0 0  
Income tax expense (benefit) (369) (81) (599) (718)  
Capital additions $ 0 $ 0 $ 0 $ 0