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Goodwill and Other Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross $ 787,507 $ 778,352
Accumulated Amortization (396,735) (273,721)
Net 390,772 504,631
Trademarks 19,900 19,900
Total intangible assets, Gross 807,407 798,252
Total intangible assets, Net 410,672 524,531
Affiliate and customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross 624,699 616,197
Accumulated Amortization (330,350) (232,193)
Net $ 294,349 384,004
Affiliate and customer relationships [Member] | Pending Litigation [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives 6 years  
Affiliate and customer relationships [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives 25 years  
Advertiser relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 46,282 46,282
Accumulated Amortization (26,028) (21,820)
Net $ 20,254 24,462
Estimated Useful Lives 11 years  
Trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 116,526 115,873
Accumulated Amortization (40,357) (19,708)
Net $ 76,169 $ 96,165
Trade names [Member] | Pending Litigation [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives 3 years  
Trade names [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives 20 years