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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)

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes interest cost component of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (m) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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