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Retirement Benefit Plans (Changes in Benefit Obligations and Plan Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | $ 646,832 | $ 660,309 |
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
Net actuarial gain | $ (152,009) | $ (16,000) |
Special termination benefits |  | 16,052 |
Benefits paid | (25,154) | (38,621) |
Benefit obligation, end of year | 495,746 | 646,832 | $ 660,309
Fair value of plan assets at beginning of year | 859,883 | 815,304 |
Actual return on plan assets | (133,843) | 83,939 |
Employer contributions | 1,150 | 1,181 |
Benefit payments | (25,154) | (38,621) |
Expenses | (1,501) | (1,920) |
Fair value of plan assets, end of year | 700,535 | 859,883 | 815,304
Funded status at end of year - net asset (liability) | 204,789 | 213,051 |
Unrecognized loss (gain) at beginning of year | 108,121 | 164,770 |
Net actuarial loss (gain) | 27,122 | (56,649) |
Unrecognized loss (gain) at end of year | 135,243 | 108,121 | 164,770
Accumulated benefit obligation | 472,843 | 607,408 |
Other Post-Retirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 20,282 | 18,330 |
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
Plan participants' contributions | $ 794 | $ 778 |
Net actuarial gain | (5,906) | (1,506) |
Special termination benefits |  | 4,173 |
Benefits paid | (1,808) | (1,934) |
Benefit obligation, end of year | 13,796 | 20,282 | $ 18,330
Employer contributions | 1,015 | 1,156 |
Plan participants' contributions | 793 | 778 |
Benefit payments | (1,808) | (1,934) |
Funded status at end of year - net asset (liability) | (13,796) | (20,282) |
Unrecognized loss (gain) at beginning of year | (3,581) | (2,804) |
Net actuarial loss (gain) | (5,256) | (777) |
Unrecognized loss (gain) at end of year | $ (8,837) | $ (3,581) | $ (2,804)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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