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Retirement Benefit Plans (Components of Net Periodic (Benefits) Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income $ (17,231) $ (28,191) $ 13,325
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6,061 7,707 7,916
Interest cost $ 25,086 $ 24,047 $ 23,854
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 $ (45,059) $ (47,626) $ (44,710)
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
Amortization of net (gain) loss/ prior service cost $ 4,404 $ 5,687 $ 7,643
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 $ (9,508) $ (10,185) $ (5,297)
Net (loss) gain recognized during the year (4,404) (5,687) (7,643)
Net actuarial loss (gain) (17,274) (26,038) 13,449
Total recognized in other comprehensive income (21,678) (31,725) 5,806
Total recognized in net periodic benefit cost and other comprehensive income $ (31,186) $ (41,910) $ 509
Discount rate for benefit obligations 5.35% 5.62% 4.83%
Discount rate for net periodic benefit cost 5.62% 4.83% 5.00%
Expected long-term return on plan assets 6.25% 6.50% 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 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 $ 24 $ 31 $ 34
Interest cost $ 520 $ 578 $ 622
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
Amortization of net (gain) loss/ prior service cost $ (1,123) $ (799) $ (843)
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 $ (579) $ (190) $ (187)
Net (loss) gain recognized during the year 1,123 799 843
Net actuarial loss (gain) 43 (2,371) 92
Total recognized in other comprehensive income 1,166 (1,572) 935
Total recognized in net periodic benefit cost and other comprehensive income $ 587 $ (1,762) $ 748
Discount rate for benefit obligations 5.28% 5.56% 4.81%
Discount rate for net periodic benefit cost 5.56% 4.81% 4.98%