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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 2,148 $ 2,828 $ 6,445 $ 8,484
Expected return on plan assets (5,744) (5,477) (17,232) (16,430)
Amortization of unrecognized net actuarial loss 626 704 1,876 2,112
Total net periodic pension benefit [1] $ (2,970) $ (1,945) $ (8,911) $ (5,834)
[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.