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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Net actuarial loss (gain) $ 20,941 $ (21,636) $ (1,515)
Reversal of amortization of net actuarial loss $ (1,668) $ (2,772) (3,015)
Retirement Income Plan [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.21% 2.98%  
Interest cost $ 9,944 $ 8,593 11,312
Expected return on plan assets (22,147) (22,976) (21,907)
Amortization of unrecognized actuarial loss 1,465 2,501 2,817
Total net periodic pension cost (benefit) [1] (10,738) (11,882) (7,778)
Net actuarial loss (gain) 23,722 (20,609) (2,894)
Reversal of amortization of net actuarial loss (1,465) (2,501) (2,817)
Total recognized in other comprehensive income 22,257 (23,110) (5,711)
Total recognized in net periodic benefit cost and OCI $ 11,519 $ (34,992) $ (13,489)
[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.