Goodwill and Other Intangible Assets (Summary Of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 778,352	$ 799,468
Accumulated Amortization	(273,721)	(240,461)
Net	504,631	559,007
Trademarks	19,900	19,900
Total intangible assets, Gross	798,252	819,368
Total intangible assets, Net	524,531	578,907
Affiliate and customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	616,197	620,771
Accumulated Amortization	(232,193)	(198,500)
Net	$ 384,004	422,271
Affiliate and customer relationships [Member] | Pending Litigation [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	6 years
Affiliate and customer relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	25 years
Advertiser relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 46,282	46,282
Accumulated Amortization	(21,820)	(17,613)
Net	$ 24,462	28,669
Estimated Useful Lives	11 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 113,075	118,772
Accumulated Amortization	(17,997)	(17,971)
Net	$ 95,078	100,801
Trade names [Member] | Pending Litigation [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	3 years
Trade names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	20 years
Other amortizable intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 2,798	13,643
Accumulated Amortization	(1,711)	(6,377)
Net	$ 1,087	$ 7,266
Other amortizable intangible assets [Member] | Pending Litigation [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Other amortizable intangible assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	11 years