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Business Segments (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Details of reportable segment          
Operating revenues     $ 498,853 $ 488,243 $ 473,869
Operating Income     140,977 130,499 127,073
Interest expense, net     (21,341) (20,730) (21,337)
Net utility plant $ 1,512,043   1,626,004 1,512,043 1,415,705
Depreciation and amortization expense     39,596 36,850 35,397
Income Tax Expense (Benefit)     30,423 28,197 24,670
Capital additions     $ 144,515 130,423 151,940
Parent Company          
Details of reportable segment          
Number of reportable segments | segment     3    
Operating revenues     $ 0 0 0
Operating Income     (9) (9) (9)
Interest expense, net     (791) (330) (539)
Net utility plant 0   0 0 0
Depreciation and amortization expense     0 0 0
Income Tax Expense (Benefit)     (81) (208) (709)
Capital additions     $ 0 0 0
GSWC          
Details of reportable segment          
Number of reportable segments | segment     1    
Operating revenues     $ 347,112 349,284 359,378
Operating Income     107,573 102,896 105,092
Net utility plant 1,400,489   1,499,745 1,400,489  
Depreciation and amortization expense     33,384 32,184 32,441
Income Tax Expense (Benefit)     22,095 21,704 20,177
GSWC | Water Service Utility Operations [Member]          
Details of reportable segment          
Operating revenues     347,112 330,637 319,830
Operating Income     107,573 97,896 93,895
Interest expense, net     (21,046) (20,312) (20,304)
Net utility plant 1,400,489   1,499,745 1,400,489 1,322,062
Depreciation and amortization expense     33,384 30,969 29,956
Income Tax Expense (Benefit)     22,095 20,515 17,295
Capital additions     123,526 107,355 131,353
GSWC | Electric:          
Details of reportable segment          
Operating revenues   $ 18,647   37,024 39,548
Operating Income       10,303 11,197
Interest expense, net       (584) (1,228)
Net utility plant 89,308     89,308 72,680
Depreciation and amortization expense       2,479 2,485
Income Tax Expense (Benefit)       2,689 2,882
Capital additions       18,393 11,499
American States Utility Services | Contracted services:          
Details of reportable segment          
Operating revenues     113,396 120,582 114,491
Operating Income     22,675 22,309 21,990
Interest expense, net     637 496 734
Net utility plant 22,246   19,751 22,246 20,963
Depreciation and amortization expense     3,640 3,402 2,956
Income Tax Expense (Benefit)     5,434 5,201 5,202
Capital additions     $ 1,130 4,675 $ 9,088
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases     50 years    
Bear Valley Electric Service, Inc. | Electric:          
Details of reportable segment          
Operating revenues $ 18,377   $ 38,345    
Operating Income     10,738    
Interest expense, net     (141)    
Net utility plant     106,508    
Depreciation and amortization expense     2,572    
Income Tax Expense (Benefit)       $ 2,975  
Capital additions     $ 19,859