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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 2,828 $ 3,376 $ 5,656 $ 6,753
Expected return on plan assets (5,476) (5,278) (10,953) (10,557)
Amortization of unrecognized net actuarial loss 704 643 1,408 1,287
Total net periodic pension cost (benefit) [1] $ (1,944) $ (1,259) $ (3,889) $ (2,517)
[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.