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Revenues Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues | $ 595,699 | $ 491,528 | $ 498,853
Cost of services | 57,912 | 53,171 | 56,909
GSWC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating revenues | 433,473 | 340,602 | 347,112
GSWC | Water: |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 400,331 | 329,650 | 351,069
Operating revenues | 433,473 | 340,602 | 347,112
GSWC | Water: | Tariff-based revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 394,623 | 324,838 | 345,562
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 2,955 | 2,461 | 3,280
GSWC | Water: | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 2,753 | 2,351 | 2,227
GSWC | Water: | Alternative revenue program |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Alternative Revenue Programs, Net | 33,142 | 10,952 | (3,957)
American States Utility Services | Contracted services: |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 120,394 | 110,940 | 113,396
Operating revenues | 120,394 | 110,940 | 113,396
American States Utility Services | Contracted services: | Water |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 75,785 | 68,626 | 71,210
American States Utility Services | Contracted services: | Wastewater |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 44,609 | 42,314 | 42,186
Golden State Water Company and Bear Valley Electric Service, Inc. | Franchisor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cost of services | 4,900 | 4,000 | 4,200
BVES | Electric: |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 40,697 | 39,894 | 37,434
Operating revenues | 41,832 | 39,986 | 38,345
BVES | Electric: | Tariff-based revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 40,130 | 39,750 | 37,124
BVES | Electric: | CPUC-approved surcharges (cost-recovery activities) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contract with customers | 567 | 144 | 310
BVES | Electric: | Alternative revenue program |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Alternative Revenue Programs, Net | $ 1,135 | $ 92 | $ 911

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