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Retirement Benefit Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income $ 37,451 $ (2,398) $ 45,198
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 12,898 10,981 12,414
Interest cost 16,207 18,843 16,762
Expected return on plan assets (48,191) (45,199) (41,033)
Amortization of net loss/ prior service cost 7,021 10,087 5,423
Net periodic benefit cost (12,065) (5,288) (6,434)
Net (loss) gain recognized during the year (7,021) (10,087) (5,423)
Net actuarial loss (gain) 35,539 (3,131) 51,915
Total recognized in other comprehensive income 28,518 (13,218) 46,492
Total recognized in net periodic benefit cost and other comprehensive income $ 16,453 $ (18,506) $ 40,058
Discount rate for benefit obligations 2.40% 3.14% 4.14%
Discount rate for net periodic benefit cost 3.14% 4.14% 3.57%
Expected long-term return on plan assets 6.50% 7.25% 7.25%
Rate of compensation increase [1] [1] [2]
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% 7.00%
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% 2.00%
Other Post-Retirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 105 $ 95 $ 120
Interest cost 484 621 621
Amortization of net loss/ prior service cost (653) (913) (434)
Net periodic benefit cost (64) (197) 307
Net (loss) gain recognized during the year 653 913 434
Net actuarial loss (gain) 1,912 733 (6,717)
Total recognized in other comprehensive income 2,565 1,646 (6,283)
Total recognized in net periodic benefit cost and other comprehensive income $ 2,501 $ 1,449 $ (5,976)
Discount rate for benefit obligations 2.31% 3.11% 4.10%
Discount rate for net periodic benefit cost 3.11% 4.10% 3.52%
[1] Graded scale, declining from 7.25% at age 20 to 2.25% at age 60
[2] Graded scale, declining from 7.00% at age 20 t0 2.00% at age 60