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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Net actuarial gain (loss) $ 19,385 $ 20,941 $ (21,636)
Reversal of amortization of net actuarial loss (3,026) (1,668) (2,772)
Retirement Income Plan [Member]      
Interest cost 15,465 9,944 8,593
Expected return on plan assets (23,091) (22,147) (22,976)
Amortization of unrecognized actuarial loss 3,001 1,465 2,501
Total net periodic pension cost (benefit) [1] (4,625) (10,738) (11,882)
Net actuarial gain (loss) 18,998 23,722 (20,609)
Reversal of amortization of net actuarial loss (3,001) (1,465) (2,501)
Total recognized in other comprehensive income 15,997 22,257 (23,110)
Total recognized in net periodic benefit cost and OCI $ 11,372 $ 11,519 $ (34,992)
[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