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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 2,149 $ 2,828 $ 4,297 $ 5,656
Expected return on plan assets (5,744) (5,476) (11,488) (10,953)
Amortization of unrecognized net actuarial loss 625 704 1,250 1,408
Total net periodic pension cost (benefit) [1] $ (2,970) $ (1,944) $ (5,941) $ (3,889)
[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.