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Retirement Plans (Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net actuarial loss (gain) $ (1,515) $ 13,795 $ 11,273
Reversal of amortization of net actuarial loss $ (3,015) $ (2,657) (2,127)
Retirement Income Plan [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.68% 3.33%  
Interest cost $ 11,312 $ 13,506 12,428
Expected return on plan assets (21,907) (21,114) (22,767)
Amortization of unrecognized actuarial loss 2,817 2,575 1,981
Total net periodic cost [1] (7,778) (5,033) (8,358)
Net actuarial loss (gain) (2,894) 11,643 12,600
Reversal of amortization of net actuarial loss (2,817) (2,575) (1,981)
Total recognized in other comprehensive income (5,711) 9,068 10,619
Total recognized in net periodic benefit cost and OCI $ (13,489) $ 4,035 $ 2,261
[1] The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.