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Retirement Benefit Plans (Changes in Benefit Obligations and Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 486,231 $ 517,648  
Service cost 6,061 7,707  
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
Net actuarial gain (loss) $ 16,517 $ (35,453)  
Benefits paid (27,988) (27,718)  
Benefit obligation, end of year 505,907 486,231 $ 517,648
Fair value of plan assets at beginning of year 734,820 723,064  
Actual return on plan assets 81,135 40,388  
Employer contributions 1,320 1,264  
Benefit payments (27,988) (27,718)  
Expenses (2,286) (2,178)  
Fair value of plan assets, end of year 787,001 734,820 723,064
Funded status at end of year - net asset (liability) 281,094 248,589  
Unrecognized loss (gain) at beginning of year 109,324 141,049  
Net actuarial loss (gain) (21,678) (31,725)  
Unrecognized loss (gain) at end of year 87,646 109,324 141,049
Accumulated benefit obligation 488,780 467,634  
Other Post-Retirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 10,447 13,404  
Service cost 24 31  
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
Plan participants' contributions $ 549 $ 608  
Plan amendments 369    
Net actuarial gain (loss) 170 (2,371)  
Benefits paid (1,469) (1,803)  
Benefit obligation, end of year 10,610 10,447 $ 13,404
Employer contributions 920 1,196  
Plan participants' contributions 549 608  
Benefit payments (1,469) (1,804)  
Funded status at end of year - net asset (liability) (10,610) (10,447)  
Unrecognized loss (gain) at beginning of year (9,474) (7,902)  
Net actuarial loss (gain) 1,166 (1,572)  
Unrecognized loss (gain) at end of year $ (8,308) $ (9,474) $ (7,902)