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Employee Benefit Plans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) participant item | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Initial health care cost for employees under age of 65 (as a percent) | 5.60% |  |
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) | 5.30% |  |
Ultimate health care cost for employees of age 65 and over (as a percent) | 4.00% |  |
Employer contribution to the plan | $ 2,700 | $ 2,700 | $ 2,500
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2,000 | $ 1,900 | $ 1,900
Union plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term return on plan assets | 5.50% | 5.75% | 6.00%
Non-union plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term return on plan assets | 3.90% | 4.00% | 4.20%
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 | 919 |  |
Eligibility for employer matching contributions, period of service | 3 years |  |
Discount rate | 5.41% | 2.89% |
Regulatory adjustment - deferred | $ 0 | $ (1,277) | $ (483)
Employer contributions | 3,089 | $ 3,489 |
Expected future employer's contribution | $ 2,800 |  |
Expected long-term return on plan assets | 5.75% | 6.00% | 6.25%
Pension Benefits | GSWC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory adjustment - deferred | $ 1,500 | $ 1,300 | $ 483
Pension Benefits | BVESI |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Regulatory adjustment - deferred | $ (490) | $ (246) | (200)
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 | 5.34% | 2.46% |
Regulatory adjustment - deferred | $ 0 | $ 0 | $ 0
Employer contributions | $ 263 | $ 242 |
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 | 5.42% | 2.87% |
Balance in Rabbi Trust | $ 27,500 |  |

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- Definition Represents the initial health care cost for employees under age of sixty-five. + References No definition available. + Details
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