Significant Accounting Policies (Stock-based Compensation and Other) (Details) - Class A Common Stock - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
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 (shares)	120,649	165,574
Class A common stock available for issuance under the plan (shares)	779,351
Compensation expense related to share awards	$ 4,100,000	$ 6,400,000
Compensation expense related to share awards, net of tax	$ 3,300,000	5,000,000
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 (shares)	98,479
Compensation expense related to share awards	$ 1,300,000	1,300,000
Compensation expense related to share awards, net of tax	$ 1,100,000	$ 1,000,000
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 (shares)	35,965	30,034
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 (shares)	1,603	480
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
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
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
Participants 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
Minimum | 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	3 years
Maximum | 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	10 years