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Significant Accounting Policies (Stock Compensation) (Details) - Shares Outstanding Class A - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Executives | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during the year under the Company's stock compensation plans (in shares) 162,670 120,649
Class A common stock available for issuance under the plan (in shares) 616,681  
Compensation expense related to share awards $ 5,200,000 $ 4,100,000
Compensation expense related to share awards, net of tax $ 4,100,000 3,300,000
Non-employee Directors | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Class A common stock available for issuance under the plan (in shares) 53,748  
Compensation expense related to share awards $ 1,300,000 1,300,000
Compensation expense related to share awards, net of tax $ 1,000,000.0 $ 1,100,000
Non-employee Directors | Restricted Stock    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during the year under the Company's stock compensation plans (in shares) 44,731 35,965
Amount of directors, annual retainer paid in restricted shares $ 110,000 $ 110,000
Annual non-employee directors retainer amount $ 175,000 $ 175,000
Non-employee Directors | Voluntary Shares    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued during the year under the Company's stock compensation plans (in shares) 0 1,603
Percentage of annual retainer that may be received in shares of Class A stock (percent) 100.00%  
Chairman | Restricted Stock    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Amount of directors, annual retainer paid in restricted shares $ 150,000 $ 150,000
Annual non-employee directors retainer amount $ 250,000 $ 250,000
Participant's Retirement Date | Executives | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 3 years 3 years
Award Date | Executives | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 5 years 5 years
Award Date | Executives | Share-based Payment Arrangement | Minimum    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 3 years 3 years
Award Date | Executives | Share-based Payment Arrangement | Maximum    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 10 years 10 years
Award Date | Non-employee Directors | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 10 years  
Participant's Retirement from Board of Directors | Non-employee Directors | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 5 years  
Minimum Age of Director Upon Retirement from Board | Non-employee Directors | Share-based Payment Arrangement    
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Duration of restrictions on stock assignment, pledges or transfers 70 years