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Employee Benefit Plans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) item participant | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Initial health care cost for employees under age of 65 (as a percent) | 5.90% |  |
Ultimate health care cost for employees under age of 65 (as a percent) | 4.00% |  |
Initial Health care cost for employees of age 65 and over (as a percent) | 6.30% |  |
Ultimate health care cost for employees of age 65 and over (as a percent) | 4.00% |  |
Employer contribution to the plan | $ 2,900 | $ 2,700 | $ 2,700
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2,200 | $ 2,000 | $ 1,900
Union plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term return on plan assets | 5.50% | 5.50% | 5.75%
Non-union plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term return on plan assets | 3.90% | 3.90% | 4.00%
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum age for eligibility under the Pension Plan | item | 21 |  |
Minimum period of service for eligibility under the Pension Plan | 5 years |  |
Normal retirement benefit (as a percent) | 2.00% |  |
Defined benefit plan number of highest consecutive years average earnings used in computing retirement benefit | 5 years |  |
Maximum number of years of credited service considered in determining retirement benefit | 40 years |  |
Number of participants in the Pension Plan | participant | 903 |  |
Eligibility for employer matching contributions, period of service | 3 years |  |
Discount rate | 5.16% | 5.41% |
Regulatory adjustment - deferred | $ (281) | $ 0 | $ (1,277)
Employer contributions | 2,946 | $ 3,089 |
Expected future employer's contribution | $ 3,300 |  |
Expected long-term return on plan assets | 5.75% | 5.75% | 6.00%
Pension Benefits | GSWC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory adjustment - deferred | $ (281) | $ (1,500) | $ 1,300
Pension Benefits | BVES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory adjustment - deferred | $ (270) | $ (490) | (246)
Pension Benefits | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of participant's eligible pay contributed to the plan by the employer | 3.00% |  |
Pension Benefits | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of participant's eligible pay contributed to the plan by the employer | 5.25% |  |
Post-Retirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.04% | 5.34% |
Regulatory adjustment - deferred | $ 0 | $ 0 | $ 0
Employer contributions | $ 265 | $ 263 |
Post-Retirement Medical Benefits | Minimum | Fixed income fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maturity period of investments | 1 year |  |
Post-Retirement Medical Benefits | Maximum | Fixed income fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maturity period of investments | 20 years |  |
SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 5.15% | 5.42% |
Balance in Rabbi Trust | $ 34,100 |  |

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