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Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Components of net periodic benefit cost [Abstract] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Recognition of actuarial loss | $ (22,438) | $ (58,147) | $ (44,491)
Pension Plan [Member] |  |  |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 3,695 | 6,538 | 7,961
Interest cost | 18,356 | 14,779 | 14,239
Expected return on plan assets | (22,910) | (28,399) | (26,244)
Amortization of actuarial loss | 0 | 34 | 4,193
Net periodic benefit cost | (859) | (7,048) | (149)
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Current year actuarial (gain) loss | (22,583) | (58,015) | (44,583)
Recognition of actuarial loss | 0 | (34) | (4,193)
Total recognized in other comprehensive income | (22,583) | (58,049) | (48,776)
Total recognized in net periodic benefit cost and other comprehensive income | (23,442) | (65,097) | (48,627)
SERP [Member] |  |  |
Components of net periodic benefit cost [Abstract] |  |  |
Service cost | 0 | 0 | 0
Interest cost | 43 | 29 | 31
Expected return on plan assets | 0 | 0 | 0
Amortization of actuarial loss | 23 | 30 | 40
Net periodic benefit cost | 66 | 59 | 71
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Current year actuarial (gain) loss | 91 | (74) | (12)
Recognition of actuarial loss | (23) | (30) | (40)
Total recognized in other comprehensive income | 68 | (104) | (52)
Total recognized in net periodic benefit cost and other comprehensive income | $ 134 | $ (45) | $ 19

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