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Retirement Benefit Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive Income/loss $ 6,735 $ 37,451 $ (2,398)
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 11,616 12,898 10,981
Interest cost 13,476 16,207 18,843
Expected return on plan assets (46,654) (48,191) (45,199)
Special termination benefits 16,052    
Amortization of net (gain) loss/ prior service cost 5,284 7,021 10,087
Net periodic benefit cost/benefit (226) (12,065) (5,288)
Net (loss) gain recognized during the year (5,284) (7,021) (10,087)
Net actuarial loss (gain) (51,365) 35,539 (3,131)
Total recognized in other comprehensive Income/loss (56,649) 28,518 (13,218)
Total recognized in net periodic benefit cost and other comprehensive income/loss $ (56,875) $ 16,453 $ (18,506)
Discount rate for benefit obligations 2.77% 2.40% 3.14%
Discount rate for net periodic benefit cost 2.40% 3.14% 4.14%
Expected long-term return on plan assets 5.75% 6.50% 7.25%
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 60 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase 2.25% 2.25% 2.25%
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 $ 93 $ 105 $ 95
Interest cost 348 484 621
Special termination benefits 4,173    
Amortization of net (gain) loss/ prior service cost (729) (653) (913)
Net periodic benefit cost/benefit 3,885 (64) (197)
Net (loss) gain recognized during the year 729 653 913
Net actuarial loss (gain) (1,506) 1,912 733
Total recognized in other comprehensive Income/loss (777) 2,565 1,646
Total recognized in net periodic benefit cost and other comprehensive income/loss $ 3,108 $ 2,501 $ 1,449
Discount rate for benefit obligations 2.32% 2.31% 3.11%
Discount rate for net periodic benefit cost 2.31% 3.11% 4.10%