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v3.20.4

Military Privatization (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Receivables from the U.S. government: |  |  |  |  |  |  |  |  |  |  |  |
Less: allowance for doubtful accounts | $ (5,316) |  |  |  | $ (916) |  |  |  | $ (5,316) | $ (916) | $ (951) | $ (1,041)
Pretax income |  |  |  |  |  |  |  |  |  |  |  |
Increase in pretax operating income | $ 29,277 | $ 39,807 | $ 35,716 | $ 25,699 | $ 24,724 | $ 42,724 | $ 39,430 | $ 20,195 | $ 130,499 | 127,073 | 100,983 |
Contracted services: |  |  |  |  |  |  |  |  |  |  |  |
Military Privatization |  |  |  |  |  |  |  |  |  |  |  |
Period of fixed price contracts to maintain water systems at various military bases |  |  |  |  |  |  |  |  | 50 years |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  | 7 |  |  |
American States Utility Services [Member] | Contracted services: |  |  |  |  |  |  |  |  |  |  |  |
Pretax income |  |  |  |  |  |  |  |  |  |  |  |
Increase in pretax operating income |  |  |  |  |  |  |  |  | $ 22,309 | $ 21,990 | $ 20,414 |

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