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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Interest cost $ 3,867 $ 2,486 $ 11,599 $ 7,458
Expected return on plan assets (5,774) (5,537) (17,319) (16,611)
Amortization of unrecognized net actuarial loss 750 366 2,251 1,099
Total net periodic pension cost (benefit) [1] $ (1,157) $ (2,685) $ (3,469) $ (8,054)
[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.