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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost $ 3,377 $ 3,095
Expected return on plan assets (5,279) (5,682)
Amortization of unrecognized net actuarial loss 644 494
Total net periodic benefit [1] $ (1,258) $ (2,093)
[1] The components of net periodic benefit cost are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.