Goodwill and Other Intangible Assets (Schedule Of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 790,807	$ 799,468
Accumulated Amortization	(270,342)	(240,461)
Net	520,465	559,007
Trademarks	19,900	19,900
Total intangible assets, gross	810,707	819,368
Total intangible assets, net	540,365	578,907
Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	609,060	620,771
Accumulated Amortization	(219,962)	(198,500)
Net	389,098	422,271
Advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross	46,282	46,282
Accumulated Amortization	(20,768)	(17,613)
Net	$ 25,514	28,669
Estimated useful lives (in years)	11 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross	$ 122,320	118,772
Accumulated Amortization	(22,166)	(17,971)
Net	100,154	100,801
Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	13,145	13,643
Accumulated Amortization	(7,446)	(6,377)
Net	$ 5,699	$ 7,266
Minimum | Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	6 years
Minimum | Trade names
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	3 years
Minimum | Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	5 years
Maximum | Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	25 years
Maximum | Trade names
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	20 years
Maximum | Other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	15 years