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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 2,486 $ 2,148 $ 7,458 $ 6,445
Expected return on plan assets (5,537) (5,744) (16,611) (17,232)
Amortization of unrecognized net actuarial loss 366 626 1,099 1,876
Total net periodic pension cost (benefit) [1] $ (2,685) $ (2,970) $ (8,054) $ (8,911)
[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.