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Stock-Based Compensation And Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Stock Options, Granted 0    
Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Stock Options, Beginning balance 713,479 711,377  
Number of Stock Options, Granted   38,803  
Number of Stock Options, Exercised (38,803)    
Number of Stock Options, Forfeited (157,332) (36,701)  
Number of Stock Options Outstanding, Ending balance 517,344 713,479 711,377
Weighted Average Exercise Price of Options Outstanding, Beginning price $ 14.64 $ 14.74  
Weighted Average Exercise Price of Options Outstanding, Granted   4.66  
Weighted Average Exercise Price of Options Outstanding, Forfeited 11.87 14.74  
Weighted Average Exercise Price of Options Outstanding, Ending price $ 15.20 $ 14.64 $ 14.74
Weighted Average Remaining Years of Contractual Life 1 year 10 months 13 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, Ending balance $ 23,750 $ 13,969 $ 136,350