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Retirement Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 1,927 | $ 1,979 | $ 3,906 | $ 3,959
Interest cost | 6,010 | 5,963 | 11,930 | 11,751
Expected return on plan assets | (11,906) | (11,178) | (23,823) | (22,356)
Amortization of net (gain) or loss and prior service costs | 1,420 | 1,911 | 2,624 | 3,681
Net periodic benefit cost | $ (2,549) | $ (1,325) | $ (5,363) | $ (2,965)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense
Other Post-Retirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 9 | $ 10 | $ 18 | $ (21)
Interest cost | 154 | 149 | 308 | 365
Amortization of net (gain) or loss and prior service costs | (185) | (158) | (370) | (409)
Net periodic benefit cost | $ (22) | $ 1 | $ (44) | $ (65)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense | Payroll Taxes Healthcare Costs Pension And Other Postretirement Benefit Expense

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