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Retirement Benefit Plans (Components of Net Periodic (Benefits) Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in other comprehensive income | $ 24,139 | $ 6,735 | $ (37,451)
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 11,438 | 11,616 | 12,898
Interest cost | $ 14,639 | $ 13,476 | $ 16,207
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
Expected return on plan assets | $ (46,615) | $ (46,654) | $ (48,191)
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
Special termination benefits |  | $ 16,052 |
Amortization of net (gain) loss/ prior service cost | $ 2,830 | $ 5,284 | $ 7,021
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
Net periodic (benefit) cost | $ (17,708) | $ (226) | $ (12,065)
Net (loss) gain recognized during the year | (2,830) | (5,284) | (7,021)
Net actuarial loss (gain) | 29,952 | (51,365) | 35,539
Total recognized in other comprehensive income | 27,122 | (56,649) | 28,518
Total recognized in net periodic benefit cost and other comprehensive income | $ 9,414 | $ (56,875) | $ 16,453
Discount rate for benefit obligations | 5.00% | 2.77% | 2.40%
Discount rate for net periodic benefit cost | 2.77% | 2.40% | 3.14%
Expected long-term return on plan assets | 5.50% | 5.75% | 6.50%
Pension Benefits [Member] | Graded Scale, 7.25% At Age 20 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 7.25% | 7.25% | 7.25%
Pension Benefits [Member] | Graded Scale, 2.25% At Age 60 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 2.25% | 2.25% | 2.25%
Pension Benefits [Member] | Graded Scale, 2.25% At Age 65 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 2.25% | 2.25% | 2.25%
Other Post-Retirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 59 | $ 93 | $ 105
Interest cost | $ 375 | $ 348 | $ 484
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
Special termination benefits |  | $ 4,173 |
Amortization of net (gain) loss/ prior service cost | $ (650) | $ (729) | $ (653)
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
Net periodic (benefit) cost | $ (216) | $ 3,885 | $ (64)
Net (loss) gain recognized during the year | 650 | 729 | 653
Net actuarial loss (gain) | (5,906) | (1,506) | 1,912
Total recognized in other comprehensive income | (5,256) | (777) | 2,565
Total recognized in net periodic benefit cost and other comprehensive income | $ (5,472) | $ 3,108 | $ 2,501
Discount rate for benefit obligations | 4.98% | 2.32% | 2.31%
Discount rate for net periodic benefit cost | 2.32% | 2.31% | 3.11%

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