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Military Privatization (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Receivables from the U.S. government: |  |  |  |
Less: allowance for doubtful accounts | $ (3,569) | $ (5,316) | $ (916) | $ (951)
Pretax income |  |  |  |
Increase in pretax operating income | $ 140,977 | 130,499 | 127,073 |
Contracted services: |  |  |  |
Military Privatization |  |  |  |
Period of fixed price contracts to maintain water systems at various military bases | 50 years |  |  |
Number of Operating Segments | 8 |  |  |
American States Utility Services | Contracted services: |  |  |  |
Pretax income |  |  |  |
Increase in pretax operating income | $ 22,675 | $ 22,309 | $ 21,990 |

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