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Goodwill and Other Intangible Assets (Schedule Of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Gross Carrying Amount of Amortizable Intangible Assets $ 645,742 $ 639,157
Accumulated amortization (213,247) (201,815)
Amortizable intangible assets, net of accumulated amortization 432,495 437,342
Trademarks 19,900 19,900
Intangible Assets, Gross, Excluding Goodwill 665,642 659,057
Total intangible assets, net 452,395 457,242
Affiliate and Customer Relationships [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 532,555 527,713
Accumulated amortization (177,019) (167,911)
Amortizable intangible assets, net of accumulated amortization $ 355,536 359,802
Advertiser Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 11 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 46,282 46,282
Accumulated amortization (14,457) (13,405)
Amortizable intangible assets, net of accumulated amortization $ 31,825 32,877
Trade Names [Member]    
Finite-Lived Intangible Asset, Useful Life 20 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 55,201 53,761
Accumulated amortization (15,422) (14,420)
Amortizable intangible assets, net of accumulated amortization 39,779 39,341
Other Amortizable Intangible Assets [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 11,704 11,401
Accumulated amortization (6,349) (6,079)
Amortizable intangible assets, net of accumulated amortization $ 5,355 $ 5,322
Minimum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 6 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