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Retirement Benefit Plans (Components of Net Periodic Benefits Cost) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total recognized in other comprehensive income $ 45,198 $ 10,929 $ 12,748
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 12,414 15,381 14,098
Interest cost 16,762 16,514 16,907
Expected return on plan assets (41,033) (37,632) (34,554)
Amortization of net loss/ prior service cost 5,423 5,554 5,783
Net periodic benefit cost (6,434) (183) 2,234
Net (loss) gain recognized during the year (5,423) (5,554) (5,783)
Net actuarial loss (gain) 51,915 (7,378) 12,128
Total recognized in other comprehensive income 46,492 (12,932) 6,345
Total recognized in net periodic benefit cost and other comprehensive income $ 40,058 $ (13,115) $ 8,579
Discount rate for benefit obligations 4.14% 3.57% 4.10%
Discount rate for net periodic benefit cost 3.57% 4.10% 4.40%
Expected long-term return on plan assets 7.25% 7.25% 7.25%
Rate of compensation increase [1]    
Pension Benefits [Member] | Graded Scale, At Age 20 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase 7.00% 7.00% 7.00%
Pension Benefits [Member] | Graded Scale, At Age 60 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase 2.00% 2.00% 2.00%
Other Post-Retirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 120 $ 129 $ 170
Interest cost 621 668 773
Amortization of net loss/ prior service cost (434) (353) 145
Net periodic benefit cost 307 444 1,088
Net (loss) gain recognized during the year 434 353 (145)
Net actuarial loss (gain) (6,717) 993 620
Total recognized in other comprehensive income (6,283) 1,346 475
Total recognized in net periodic benefit cost and other comprehensive income $ (5,976) $ 1,790 $ 1,563
Discount rate for benefit obligations 4.10% 3.52% 3.95%
Discount rate for net periodic benefit cost 3.52% 3.95% 4.32%
[1] Graded scale, declining from 7.00% at age 20 to 2.00% at age 60