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Bank Debt (Details) $ in Thousands |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2023 | Dec. 31, 2025 | Dec. 31, 2024 USD ($) unit | Dec. 31, 2023 USD ($) | Feb. 12, 2025 USD ($) | Aug. 01, 2024 USD ($) | Feb. 15, 2024 USD ($) | Nov. 06, 2023 USD ($) | Nov. 05, 2023 USD ($) | Jun. 27, 2023 USD ($) | Jan. 13, 2023 USD ($)
Bank debt |  |  |  |  |  |  |  |  |  |  |
Number of credit facilities | unit |  |  | 3 |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  | $ 165,000 |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  |  | $ 75,000 |  |
Note payable to bank, noncurrent |  |  | $ 165,000 | $ 291,500 |  |  |  |  |  |  |
BVES |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 24 months |  |  |  |  |  |  |  |
BVES | Subsequent Event | Debt due Feb 2030 |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 50,000 |  |  |  |  |  |
BVES | Financing Applications |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Regulatory Rate Case Filings Requested Authorization For Debt And Equity Issuance Amount |  |  |  |  |  | $ 120,000 |  |  |  |  |
GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 24 months |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital |  |  | 0.4754 |  |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  | $ 0 | 150,000 |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 130,000
Maximum | GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital |  |  | 0.6667 |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  | $ 150,000 |  |
Notes Payable |  |  | $ 289,000 | 333,500 |  |  |  |  |  |  |
Average Amount Outstanding |  |  | $ 315,811 | $ 243,355 |  |  |  |  |  |  |
Weighted Average Annual Interest Rate (as a percent) |  |  | 6.29% | 6.11% |  |  |  |  |  |  |
Maximum Amount Outstanding |  |  | $ 372,500 | $ 333,500 |  |  |  |  |  |  |
Revolving Credit Facility | BVES |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 65,000 |  |  |  |
Interest coverage ratio |  |  | 4.60 |  |  |  |  |  |  |  |
Total funded debt ratio |  |  | 0.44 |  |  |  |  |  |  |  |
Line of credit facility, accordion feature, increase limit |  |  |  |  |  |  | $ 10,000 |  |  |  |
Note payable to bank, noncurrent |  |  | $ 45,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  | $ 75,000 |  |  |  |  |  |  |  |
Debt issuance costs, line of credit arrangements, gross |  |  | $ 800 |  |  |  |  |  |  |  |
Total funded debt ratio |  |  | 0.48 |  |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  | $ 124,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital |  |  | 0.65 |  |  |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  | 5.94% | 6.96% |  |  |  |  |  |  |
Revolving Credit Facility | Maximum | GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  | $ 200,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  | 5.33% | 6.33% |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | BVES |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  | 3.0 |  |  |  |  |  |  |  |
Revolving Credit Facility | Minimum | BVES | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  | 4.5 |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 10,000 |  |  |
Letters of credit | GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 20,000 |  |  |  |  |  |  |  |
AWR |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  | $ 120,000 | $ 141,500 |  |  |  |  |  |  |
AWR | Maximum |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  | $ 280,000 |
AWR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |  |  |  |
Debt issuance costs, line of credit arrangements, gross |  |  | $ 600 |  |  |  |  |  |  |  |
Total funded debt ratio |  |  | 0.51 |  |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  | $ 120,000 |  |  |  |  |  |  |  |
Notes Payable |  |  | 120,000 | 141,500 |  |  |  |  |  |  |
Average Amount Outstanding |  |  | $ 122,896 | $ 156,533 |  |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  | 5.44% | 6.45% |  |  |  |  |  |  |
Weighted Average Annual Interest Rate (as a percent) |  |  | 6.29% | 5.92% |  |  |  |  |  |  |
Maximum Amount Outstanding |  |  | $ 145,500 | $ 257,500 |  |  |  |  |  |  |

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