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Bank Debt (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Jun. 30, 2020 | Feb. 11, 2020 | Mar. 31, 2019
Bank debt |  |  |  |  |  |
Maximum borrowing capacity | $ 225,000,000.0 |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Balance outstanding at the end of the period | 205,000,000.0 |  |  |  |  |
Notes payable to banks | 5,000,000 | $ 0 |  |  |  |
Long-term Debt [Member] |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Balance outstanding at the end of the period | $ 205,000,000.0 |  |  |  |  |
Short-term borrowing (excluding letters of credit) |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Notes payable to banks |  | $ 95,500,000 |  |  |  |
Interest Rate at the end of the period (as a percent) | 2.44% | 3.19% |  |  |  |
Average amount outstanding | $ 167,392,000 | $ 69,559,000 |  |  |  |
Weighted Average Annual Interest Rate (as a percent) | 2.88% | 2.66% |  |  |  |
Maximum Amount Outstanding | $ 205,500,000 | $ 95,500,000 |  |  |  |
Syndicated revolving credit facility |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Variable rate basis | Euro rate |  |  |  |  |
Syndicated revolving credit facility | Minimum |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Interest coverage ratio | 3.25 |  |  |  |  |
Syndicated revolving credit facility | Maximum |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Total funded debt ratio | 0.65 |  |  |  |  |
Syndicated revolving credit facility | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Letter of credit, amount | $ 15,000,000 |  |  |  |  |
AWR |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Maximum borrowing capacity | 225,000,000.0 |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Notes payable to banks | $ 5,000,000 | $ 0 |  |  |  |
AWR | Syndicated revolving credit facility |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Interest coverage ratio | 6.89 |  |  |  |  |
Total funded debt ratio | 0.45 |  |  |  |  |
AWR | Syndicated revolving credit facility | Minimum |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Interest coverage ratio | 3.25 |  |  |  |  |
Total funded debt ratio | 0.65 |  |  |  |  |
AWR | Syndicated revolving credit facility | Maximum |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |
Total funded debt ratio | 1.00 |  |  |  |  |
AWR | Syndicated revolving credit facility | Letters of credit |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Maximum borrowing capacity | $ 25,000,000.0 |  |  |  |  |
Letter of credit, amount | $ 940,000 |  |  |  |  |
Letter of credit fee (as a percent) | 0.65% |  |  |  |  |
AWR | Syndicated revolving credit facility | Letter of Credit Business Automobile Insurance Policy Security [Member] |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Letter of credit, amount | $ 340,000 |  |  |  |  |
AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Letter of credit, amount | $ 585,000,000 |  |  |  |  |
Syndicated revolving credit facility | AWR |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 200,000,000.0
Syndicated revolving credit facility | AWR | Minimum |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 150,000,000.0
Subsequent Event [Member] | AWR |  |  |  |  |  |
Bank debt |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 200,000,000.0 | $ 200,000,000.0 | $ 260,000,000.0 |

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