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Revenues Disaggregation of Revenue (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) unit | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Electric |  |  | $ 38,345 | $ 37,024 | $ 39,548
Operating revenues |  |  | 498,853 | 488,243 | 473,869
GSWC |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Electric |  |  | 0 | 18,647 | 39,548
Operating revenues |  |  | 347,112 | 349,284 | 359,378
GSWC | Water: |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 351,069 | 335,506 | 311,572
Operating revenues |  |  | 347,112 | 330,637 | 319,830
GSWC | Water: | Tariff-based revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 345,562 | 329,670 | 305,244
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities) |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 3,280 | 3,736 | 4,322
GSWC | Water: | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 2,227 | 2,100 | 2,006
GSWC | Water: | Alternative revenue program |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Regulated Operating Revenue |  |  | $ (3,957) | (4,869) | 8,258
GSWC | Electric: |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  |  |  | 37,038
Electric |  |  |  |  | (2,510)
Operating revenues |  | $ 18,647 |  | 37,024 | 39,548
GSWC | Electric: | Tariff-based revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  |  |  | 36,628
GSWC | Electric: | CPUC-approved surcharges (cost-recovery activities) |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  |  |  | 410
American States Utility Services | Contracted services: |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |  |
Revenue from contract with customers |  |  | $ 113,396 | 120,582 | 114,491
Operating revenues |  |  | $ 113,396 | 120,582 | 114,491
Number of construction performance obligation | unit |  |  | 1 |  |
American States Utility Services | Contracted services: | Water |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | $ 71,210 | 74,898 | 59,868
American States Utility Services | Contracted services: | Wastewater |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 42,186 | 45,684 | $ 54,623
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  |  | 35,969 |
Electric |  |  |  | 1,055 |
Operating revenues |  |  |  | 37,024 |
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: | Tariff-based revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  |  | 35,283 |
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: | CPUC-approved surcharges (cost-recovery activities) |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  |  | $ 686 |
Bear Valley Electric Service, Inc. | Electric: |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 37,434 |  |
Electric |  |  | 911 |  |
Operating revenues | $ 18,377 |  | 38,345 |  |
Bear Valley Electric Service, Inc. | Electric: | Tariff-based revenues |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | 37,124 |  |
Bear Valley Electric Service, Inc. | Electric: | CPUC-approved surcharges (cost-recovery activities) |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from contract with customers |  |  | $ 310 |  |

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