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Revenues Disaggregation of Revenue (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) unit | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prerequisites for Billing, Long-term Contracts |  |  |  |  |  |  |  |  | P5Y |  |
BRRAM over-collection (alternative revenue program) |  |  |  |  |  |  |  |  | $ (39,548) | $ (34,350) | $ (33,969)
Operating revenues | $ 112,993 | $ 134,496 | $ 124,647 | $ 101,733 | $ 111,005 | $ 124,182 | $ 106,901 | $ 94,728 | 473,869 | 436,816 | 440,603
GSWC |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
BRRAM over-collection (alternative revenue program) |  |  |  |  |  |  |  |  | (39,548) | (34,350) | (33,969)
Operating revenues | $ 81,233 | $ 107,245 | $ 95,548 | $ 75,352 | $ 75,226 | $ 95,564 | $ 84,574 | $ 74,244 | 359,378 | 329,608 | 340,301
GSWC | Water: |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | 311,572 | 303,593 |
Regulated Operating Revenue |  |  |  |  |  |  |  |  | 8,258 | (8,335) |
Operating revenues |  |  |  |  |  |  |  |  | 319,830 | 295,258 | 306,332
GSWC | Water: | Tariff-based revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | 305,244 | 298,818 |
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities) |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | 4,322 | 2,962 |
GSWC | Water: | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | 2,006 | 1,813 |
GSWC | Electric: |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | 37,038 | 34,715 |
BRRAM over-collection (alternative revenue program) |  |  |  |  |  |  |  |  | 2,510 | (365) |
Operating revenues |  |  |  |  |  |  |  |  | 39,548 | 34,350 | 33,969
GSWC | Electric: | Tariff-based revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | 36,628 | 34,501 |
GSWC | Electric: | CPUC-approved surcharges (cost-recovery activities) |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | $ 410 | 214 |
American States Utility Services [Member] | 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 |  |  |  |  |  |  |  |  | $ 114,491 | 107,208 |
Operating revenues |  |  |  |  |  |  |  |  | $ 114,491 | 107,208 | $ 100,302
Number of construction performance obligation | unit |  |  |  |  |  |  |  |  | 1 |  |
American States Utility Services [Member] | Contracted services: | Water |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | $ 59,868 | 62,273 |
American States Utility Services [Member] | Contracted services: | Wastewater |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from contract with customers |  |  |  |  |  |  |  |  | $ 54,623 | $ 44,935 |

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