Goodwill and Other Intangible Assets (Schedule of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross	$ 788,655	$ 787,507
Accumulated Amortization	(412,557)	(396,735)
Net	376,098	390,772
Trademarks	19,900	19,900
Total intangible assets, gross	808,555	807,407
Total intangible assets, net	395,998	410,672
Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	622,517	624,699
Accumulated Amortization	(343,335)	(330,350)
Net	279,182	294,349
Advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross	46,282	46,282
Accumulated Amortization	(28,132)	(26,028)
Net	$ 18,150	20,254
Estimated useful lives (in years)	11 years
Trade names and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	$ 119,856	116,526
Accumulated Amortization	(41,090)	(40,357)
Net	$ 78,766	$ 76,169
Minimum | Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	6 years
Minimum | Trade names and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	3 years
Maximum | Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	25 years
Maximum | Trade names and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives (in years)	20 years