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Retirement Plans (Funded Status of Retirement Income Plan and Retirement Life Plan) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Retirement Income Plan [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.21% 2.98%  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [1] $ (10,738) $ (11,882) $ (7,778)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 407,758 425,161  
Interest cost 9,944 8,593 11,312
Actuarial losses (gains) (91,653) (12,844)  
Benefits paid (14,104) (13,152)  
Benefit obligation, end of year 311,945 407,758 425,161
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets, beginning of year 450,305 432,716  
Actual return on plan assets, net of expenses (93,227) 30,741  
Benefits paid (14,104) (13,152)  
Fair value of assets, end of year 342,974 450,305 432,716
Funded status 31,029 42,547  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 31,029 42,547  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net actuarial loss 100,561 78,304  
Weighted-Average Liability Asumptions      
Accumulated benefit obligation 311,945 407,758  
Retirement Life Plan [Member]      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Contributions by the employer to funded plans $ 19,800 $ 19,200 $ 18,600
[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.