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Share-Based Compensation And Stock Repurchase Plans (Summary Of Stock Options Outstanding And Exercisable) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Stock Options, Granted 0      
Weighted Average Exercise Price of Options Outstanding, Granted     $ 4.66  
Weighted Average Remaining Years of Contractual Life 1 year 2 months 26 days 1 year 7 months 28 days 2 years 2 months 4 days 2 years 9 months 14 days
Aggregate Intrinsic Value, Beginning balance   $ 13,969 $ 136,350  
Aggregate Intrinsic Value, Exercised   $ 63,831    
Aggregate Intrinsic Value, Ending balance     $ 13,969 $ 136,350
Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Stock Options, Beginning balance 517,344 713,479 711,377  
Number of Stock Options, Granted     38,803  
Number of Stock Options, Exercised   (38,803)    
Number of Stock Options, Expired (189,846) (157,332) (36,701)  
Number of Stock Options Outstanding, Ending balance 327,498 517,344 713,479 711,377
Weighted Average Exercise Price of Options Outstanding, Beginning price $ 15.42 $ 14.64 $ 14.74  
Weighted Average Exercise Price of Options Outstanding, Granted     4.66  
Weighted Average Exercise Price of Options Outstanding, Exercised   4.66    
Weighted Average Exercise Price of Options Outstanding, Expired 14.63 11.87 14.74  
Weighted Average Exercise Price of Options Outstanding, Ending price $ 15.87 $ 15.42 $ 14.64 $ 14.74