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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 134,984 $ 136,755 $ 366,161 $ 382,229
GOLDEN STATE WATER COMPANY        
Disaggregation of Revenue [Line Items]        
Total operating revenues 100,799 102,768 265,561 269,430
Water: | GOLDEN STATE WATER COMPANY        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 92,295 101,937 250,840 265,461
Total operating revenues 100,799 102,768 265,561 269,430
Electric: | BVESI        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 8,920 8,823 29,912 29,076
Total operating revenues 8,919 8,564 29,028 28,211
Contracted services: | ASUS        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 25,266 25,423 71,572 84,588
Tariff-based revenues | Water: | GOLDEN STATE WATER COMPANY        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 90,998 100,256 247,108 261,231
Tariff-based revenues | Electric: | BVESI        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 8,891 8,791 29,824 28,798
Surcharges (cost-recovery activities) | Water: | GOLDEN STATE WATER COMPANY        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 672 1,095 2,018 2,604
Surcharges (cost-recovery activities) | Electric: | BVESI        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 29 32 88 278
Other | Water: | GOLDEN STATE WATER COMPANY        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 625 586 1,714 1,626
WRAM under-collection (alternative revenue program) | Water: | GOLDEN STATE WATER COMPANY        
Disaggregation of Revenue [Line Items]        
Alternative revenue programs, net 8,504 831 14,721 3,969
WRAM under-collection (alternative revenue program) | Electric: | BVESI        
Disaggregation of Revenue [Line Items]        
Alternative revenue programs, net (1) (259) (884) (865)
Water | Contracted services: | ASUS        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax 16,142 15,454 43,862 53,102
Wastewater | Contracted services: | ASUS        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 9,124 $ 9,969 $ 27,710 $ 31,486