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Retirement Benefit Plans (Changes in Benefit Obligations and Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 660,309 $ 581,866  
Service cost 11,616 12,898 $ 10,981
Interest cost 13,476 16,207 18,843
Net actuarial gain (loss) (16,000) 70,777  
Special termination benefits 16,052    
Benefits paid (38,621) (21,439)  
Benefit obligation, end of year 646,832 660,309 581,866
Fair value of plan assets at beginning of year 815,304 752,138  
Actual return on plan assets 83,939 84,810  
Employer contributions 1,181 1,178  
Benefit payments (38,621) (21,439)  
Expenses (1,920) (1,383)  
Fair value of plan assets, end of year 859,883 815,304 752,138
Funded status at end of year - net asset (liability) 213,051 154,995  
Unrecognized loss at beginning of year 164,770 136,252  
Net actuarial loss (gain) (56,649) 28,518  
Unrecognized gain (loss) at end of year 108,121 164,770 136,252
Accumulated benefit obligation 607,408 624,999  
Other Post-Retirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 18,330 16,713  
Service cost 93 105 95
Interest cost 348 484 621
Plan participants' contributions 778 538  
Net actuarial gain (loss) (1,506) 1,910  
Special termination benefits 4,173    
Benefits paid (1,934) (1,420)  
Benefit obligation, end of year 20,282 18,330 16,713
Employer contributions 1,156 882  
Plan participants' contributions 778 538  
Benefit payments (1,934) (1,420)  
Funded status at end of year - net asset (liability) (20,282) (18,330)  
Unrecognized loss at beginning of year (2,804) (5,369)  
Net actuarial loss (gain) (777) 2,565  
Unrecognized gain (loss) at end of year $ (3,581) $ (2,804) $ (5,369)