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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Interest cost $ 3,866 $ 2,486 $ 7,732 $ 4,972
Expected return on plan assets (5,772) (5,537) (11,545) (11,074)
Amortization of unrecognized net actuarial loss 750 367 1,501 733
Total net periodic pension cost (benefit) [1] $ (1,156) $ (2,684) $ (2,312) $ (5,369)
[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.