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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 3,376 $ 3,095 $ 6,753 $ 6,190
Expected return on plan assets (5,278) (5,681) (10,557) (11,363)
Amortization of unrecognized net actuarial loss 643 493 1,287 987
Total net periodic benefit [1] $ (1,259) $ (2,093) $ (2,517) $ (4,186)
[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.