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Significant Accounting Policies (Share-based Compensation) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Advertising expense $ 21,800,000 $ 20,400,000 $ 20,100,000
Product development costs 9,600,000 $ 9,600,000 8,100,000
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amount of directors, annual retainer paid in restricted shares 75,000    
Annual non-employee directors retainer amount $ 131,000    
Shares Outstanding Class A      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Class A common stock available for issuance under the plan (shares) 80,701    
Stock Compensation Plan [Member] | Shares Outstanding Class A | Executives      
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) 37,986 32,591  
Class A common stock available for issuance under the plan (shares) 163,182    
Compensation expense related to share awards $ 1,700,000 $ 1,800,000 900,000
Compensation expense related to share awards, net of tax $ 1,100,000 1,200,000 600,000
Stock Compensation Plan [Member] | Shares Outstanding Class A | Non-employee directors      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Class A common stock available for issuance under the plan (shares) 47,212    
Compensation expense related to share awards $ 700,000 600,000 600,000
Compensation expense related to share awards, net of tax $ 500,000 $ 400,000 $ 400,000
Stock Compensation Plan [Member] | Shares Outstanding Class A | Participant's Retirement Date | Executives      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Duration of restrictions on stock assignment, pledges or transfers 5 years    
Stock Compensation Plan [Member] | Shares Outstanding Class A | Date of award | Executives      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Duration of restrictions on stock assignment, pledges or transfers 10 years    
Stock Compensation Plan [Member] | Shares Outstanding Class A | Date of award | Non-employee directors      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Duration of restrictions on stock assignment, pledges or transfers 10 years    
Stock Compensation Plan [Member] | Shares Outstanding Class A | Participants retirement from board of directors | Non-employee directors      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Duration of restrictions on stock assignment, pledges or transfers 5 years    
Stock Compensation Plan [Member] | Shares Outstanding Class A | Minimum age of director upon retirement from board | Non-employee directors      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Duration of restrictions on stock assignment, pledges or transfers 70 years    
Restricted stock | Shares Outstanding Class A | Non-employee directors      
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) 11,496 10,446 9,472
Amount of directors, annual retainer paid in restricted shares   $ 69,000 $ 69,000
Annual non-employee directors retainer amount   $ 125,000 $ 125,000
Percentage of annual retainer that may be received in shares of Class A stock (percent) 100.00%    
Voluntary shares | Shares Outstanding Class A | Non-employee directors      
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) 2,553 1,335 1,300
New Accounting Pronouncement, Early Adoption, Effect [Member]      
Schedule of Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase in non-current deferred income taxes $ 18,600,000