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Goodwill and Other Intangible Assets (Schedule Of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Gross Carrying Amount of Amortizable Intangible Assets $ 630,910 $ 615,996
Accumulated amortization (171,631) (150,228)
Amortizable intangible assets, net of accumulated amortization 459,279 465,768
Trademarks 19,900 20,041
Intangible Assets, Gross, Excluding Goodwill 650,810 636,037
Total intangible assets, net 479,179 485,809
Affiliate and Customer Relationships [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 520,722 509,992
Accumulated amortization (151,059) (133,932)
Amortizable intangible assets, net of accumulated amortization $ 369,663 376,060
Advertiser Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 11 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 46,282 46,282
Accumulated amortization (11,302) (9,198)
Amortizable intangible assets, net of accumulated amortization 34,980 37,084
Trade Names [Member]    
Gross Carrying Amount of Amortizable Intangible Assets 53,055 49,720
Accumulated amortization (8,046) (6,307)
Amortizable intangible assets, net of accumulated amortization $ 45,009 43,413
Other Amortizable Intangible Assets [Member]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Gross Carrying Amount of Amortizable Intangible Assets $ 10,851 10,002
Accumulated amortization (1,224) (791)
Amortizable intangible assets, net of accumulated amortization $ 9,627 $ 9,211
Minimum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 10 years  
Minimum [Member] | Trade Names [Member]    
Finite-Lived Intangible Asset, Useful Life 12 years  
Maximum [Member] | Affiliate and Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 25 years  
Maximum [Member] | Trade Names [Member]    
Finite-Lived Intangible Asset, Useful Life 20 years