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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, 2019
Dec. 31, 2018
Gross $ 799,791 $ 799,468
Accumulated Amortization (250,164) (240,461)
Net 549,627 559,007
Trademarks 19,900 19,900
Total intangible assets, gross 819,691 819,368
Total intangible assets, net 569,527 578,907
Affiliate and customer relationships    
Gross 615,628 620,771
Accumulated Amortization (205,195) (198,500)
Net $ 410,433 422,271
Advertiser relationships    
Estimated useful lives (in years) 11 years  
Gross $ 46,282 46,282
Accumulated Amortization (18,665) (17,613)
Net $ 27,617 28,669
Trade names    
Estimated useful lives (in years) 20 years  
Gross $ 124,453 118,772
Accumulated Amortization (19,756) (17,971)
Net 104,697 100,801
Other amortizable intangible assets    
Gross 13,428 13,643
Accumulated Amortization (6,548) (6,377)
Net $ 6,880 $ 7,266
Minimum | Affiliate and customer relationships    
Estimated useful lives (in years) 6 years  
Minimum | Trade names    
Estimated useful lives (in years) 3 years  
Minimum | Other amortizable intangible assets    
Estimated useful lives (in years) 5 years  
Maximum | Affiliate and customer relationships    
Estimated useful lives (in years) 25 years  
Maximum | Other amortizable intangible assets    
Estimated useful lives (in years) 15 years