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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost $ 3,095 $ 3,111 $ 9,285 $ 9,332
Expected return on plan assets (5,681) (4,854) (17,044) (14,563)
Amortization of unrecognized net actuarial loss 494 481 1,481 1,444
Total net periodic benefit [1] $ (2,092) $ (1,262) $ (6,278) $ (3,787)
[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.