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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 400 $ 400 $ 400
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 9,500    
Benefit obligation, end of year $ 10,900 $ 9,500  
Retirement Income Plan [Member]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.33% 4.46%  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [1] $ (5,033) $ (8,358) (4,928)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 334,679 364,411  
Interest cost 13,506 12,428 12,490
Actuarial losses (gains) 54,478 (31,738)  
Benefits paid fair value (11,642) (10,422)  
Benefit obligation, end of year 391,021 334,679 364,411
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of assets, beginning of year 331,680 363,673  
Actual return on plan assets, net of expenses 63,949 (21,571)  
Contributions by the employer to funded plans 1,100 0  
Fair value of assets, end of year 385,087 331,680 363,673
Funded status (5,934) (2,999)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Liabilities (5,934) (2,999)  
Net pension liability, end of year (5,934) (2,999)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net actuarial loss 107,125 98,057  
Total 107,125 98,057  
Weighted-Average Liability Asumptions      
Accumulated benefit obligation 391,021 334,679  
Retirement Life Plan [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 300 300 300
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 5,800    
Benefit obligation, end of year 6,600 5,800  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Contributions by the employer to funded plans $ 17,000 $ 15,800 $ 15,800
[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.