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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Weighted Average Number of Shares
The following is a reconciliation between basic and diluted weighted average shares outstanding:
(In thousands)Years Ended December 31,
202020192018
Basic weighted average shares outstanding51,016 56,205 58,066 
Effect of dilution:
Stock options— 14 15 
Restricted stock units717 818 866 
Diluted weighted average shares outstanding51,733 57,037 58,947 
Schedule of Stock by Class
 Shares Outstanding
(In thousands)
Class A 
Common Stock
Class B 
Common Stock
Balance at December 31, 201749,601 11,484 
Share repurchases(5,386)— 
Employee and non-employee director stock transactions*534 — 
Balance at December 31, 201844,749 11,484 
Share repurchases(1,302)— 
Employee and non-employee director stock transactions*631 — 
Balance at December 31, 201944,078 11,484 
Share repurchases(14,785)— 
Employee and non-employee director stock transactions*682 — 
Balance at December 31, 202029,975 11,484 
*Reflects common stock activity in connection with restricted stock units and stock options granted to employees, as well as in connection with the fulfillment of employees' statutory tax withholding obligations for applicable income and other employment taxes and forfeited employee restricted stock units.