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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Income Plan [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.98% 2.68%  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [1] $ (11,882) $ (7,778) $ (5,033)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 425,161 391,021  
Interest cost 8,593 11,312 13,506
Actuarial losses (gains) (12,844) 35,276  
Benefits paid fair value (13,152) (12,448)  
Benefit obligation, end of year 407,758 425,161 391,021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets, beginning of year 432,716 385,087  
Actual return on plan assets, net of expenses 30,741 60,077  
Fair value of assets, end of year 450,305 432,716 385,087
Funded status 42,547 7,555  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Net pension asset (liability), end of year 42,547 7,555  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net actuarial loss 78,304 101,414  
Weighted-Average Liability Asumptions      
Accumulated benefit obligation 407,758 425,161  
Retirement Life Plan [Member]      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Contributions by the employer to funded plans $ 19,200 $ 18,600 $ 17,300
[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.