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Goodwill and Other Intangible Assets (Schedule Of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Gross Carrying Amount of Amortizable Intangible Assets $ 677,617 $ 639,157
Accumulated amortization (227,760) (201,815)
Amortizable intangible assets, net of accumulated amortization 449,857 437,342
Trademarks 19,900 19,900
Intangible Assets, Gross, Excluding Goodwill 697,517 659,057
Total intangible assets, net 469,757 457,242
Affiliate and Customer Relationships [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 543,570 527,713
Accumulated amortization (188,571) (167,911)
Amortizable intangible assets, net of accumulated amortization $ 354,999 359,802
Advertiser Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 11 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 46,282 46,282
Accumulated amortization (16,561) (13,405)
Amortizable intangible assets, net of accumulated amortization $ 29,721 32,877
Trade Names [Member]    
Finite-Lived Intangible Asset, Useful Life 20 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 73,973 53,761
Accumulated amortization (16,344) (14,420)
Amortizable intangible assets, net of accumulated amortization 57,629 39,341
Other Amortizable Intangible Assets [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 13,792 11,401
Accumulated amortization (6,284) (6,079)
Amortizable intangible assets, net of accumulated amortization $ 7,508 $ 5,322
Minimum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 6 years  
Minimum [Member] | Trade Names [Member]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Minimum [Member] | Other Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Maximum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 25 years  
Maximum [Member] | Other Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Asset, Useful Life 15 years