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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, 2016
Dec. 31, 2015
Gross Carrying Amount of Amortizable Intangible Assets $ 661,153 $ 648,831
Accumulated amortization (130,132) (119,551)
Amortizable intangible assets, net of accumulated amortization 531,021 529,280
Trademarks 19,900 19,900
Intangible Assets, Gross, Excluding Goodwill 681,053 668,731
Total intangible assets, net 550,921 549,180
Affiliate and Customer Relationships [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 546,308 554,012
Accumulated amortization (118,551) (110,203)
Amortizable intangible assets, net of accumulated amortization $ 427,757 443,809
Advertiser Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 11 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 46,282 46,282
Accumulated amortization (6,042) (4,990)
Amortizable intangible assets, net of accumulated amortization $ 40,240 41,292
Trade Names [Member]    
Finite-Lived Intangible Asset, Useful Life 20 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 57,756 48,522
Accumulated amortization (5,229) (4,353)
Amortizable intangible assets, net of accumulated amortization $ 52,527 44,169
Other Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Asset, Useful Life 5 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 10,807 15
Accumulated amortization (310) (5)
Amortizable intangible assets, net of accumulated amortization $ 10,497 $ 10
Minimum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 11 years  
Maximum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 25 years