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Bank Debt (Details) $ in Thousands |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 USD ($) unit | Dec. 31, 2022 USD ($) | Feb. 15, 2024 USD ($) | Nov. 06, 2023 USD ($) | Nov. 05, 2023 USD ($) | Jun. 27, 2023 USD ($) | Jun. 16, 2023 USD ($) | Jun. 15, 2023 USD ($)
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 |  |  |  | $ 291,500 | $ 22,000 |  |  |  |  |  |
Notes payable to bank |  |  |  | $ 42,000 | 255,500 |  |  |  |  |  |
BVES |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 24 months |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  |  |  |  |  |  |  | $ 25,000 |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 35,000
GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Ratio of Indebtedness to Net Capital |  |  |  | 0.4956 |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  |  | $ 150,000 | 0 |  |  |  |  |  |
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 |  |  |  | $ 333,500 | 277,500 |  |  |  |  |  |
Average Amount Outstanding |  |  |  | 243,355 | 226,556 |  |  |  |  |  |
Maximum Amount Outstanding |  |  |  | $ 333,500 | $ 277,500 |  |  |  |  |  |
Weighted Average Annual Interest Rate (as a percent) |  |  |  | 6.11% | 2.55% |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  | $ 333,500 | $ 277,500 |  |  |  |  |  |
Weighted Average Annual Interest Rate (as a percent) |  |  |  | 6.11% | 2.55% |  |  |  |  |  |
Average Amount Outstanding |  |  |  | $ 243,355 | $ 226,556 |  |  |  |  |  |
Maximum Amount Outstanding |  |  |  | $ 333,500 | $ 277,500 |  |  |  |  |  |
Revolving Credit Facility | BVES |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 50,000 |
Interest coverage ratio |  |  |  | 4.51 |  |  |  |  |  |  |
Total funded debt ratio |  |  |  | 0.52 |  |  |  |  |  |  |
Notes payable to bank |  |  |  | $ 42,000 |  |  |  |  |  |  |
Revolving Credit Facility | BVES | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 65,000 |  |  |  |  |
Revolving Credit Facility | GSWC |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Incremental expansion of borrowing capacity |  |  |  | 75,000 |  |  |  |  |  |  |
Debt issuance costs, line of credit arrangements, gross |  |  |  | $ 802 |  |  |  |  |  |  |
Total funded debt ratio |  |  |  | 0.50 |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  |  | $ 150,000 |  |  |  |  |  |  |
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) |  |  |  | 6.96% | 5.89% |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  |  | 6.96% | 5.89% |  |  |  |  |  |
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) |  |  |  | 6.33% | 5.07% |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  |  | 6.33% | 5.07% |  |  |  |  |  |
Revolving Credit Facility | Minimum | BVES | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  | 4.5 | 3.0 |  |  |  |  |  |  |  |
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 |  |  |  | 141,500 | $ 0 |  |  |  |  |  |
Notes payable to bank |  |  |  | $ 0 | 255,500 |  |  |  |  |  |
AWR | Maximum |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  | $ 280,000 |  |
AWR | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Total funded debt ratio |  |  |  | 0.54 |  |  |  |  |  |  |
Note payable to bank, noncurrent |  |  |  | $ 141,500 |  |  |  |  |  |  |
Notes Payable |  |  |  | 141,500 | 255,500 |  |  |  |  |  |
Average Amount Outstanding |  |  |  | 156,533 | 213,758 |  |  |  |  |  |
Maximum Amount Outstanding |  |  |  | $ 257,500 | $ 255,500 |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  |  | 6.45% | 5.07% |  |  |  |  |  |
Weighted Average Annual Interest Rate (as a percent) |  |  |  | 5.92% | 2.56% |  |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  |  | $ 141,500 | $ 255,500 |  |  |  |  |  |
Interest Rate at the end of the period (as a percent) |  |  |  | 6.45% | 5.07% |  |  |  |  |  |
Weighted Average Annual Interest Rate (as a percent) |  |  |  | 5.92% | 2.56% |  |  |  |  |  |
Average Amount Outstanding |  |  |  | $ 156,533 | $ 213,758 |  |  |  |  |  |
Maximum Amount Outstanding |  |  |  | 257,500 | $ 255,500 |  |  |  |  |  |
Parent | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Bank debt |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, line of credit arrangements, gross |  |  |  | $ 632 |  |  |  |  |  |  |

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