XML 59 R70.htm IDEA: XBRL DOCUMENT v3.20.1
Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost $ 2,828 $ 3,377
Expected return on plan assets (5,477) (5,279)
Amortization of unrecognized net actuarial loss 704 644
Total net periodic cost (benefit) [1] $ (1,945) $ (1,258)
[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.