Goodwill and Other Intangible Assets (Schedule of Finite and Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross	$ 778,329	$ 778,352
Accumulated Amortization	(380,451)	(273,721)
Net	397,878	504,631
Trademarks	19,900	19,900
Total intangible assets, gross	798,229	798,252
Total intangible assets, net	417,778	524,531
Affiliate and customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	617,178	616,197
Accumulated Amortization	(317,770)	(232,193)
Net	299,408	384,004
Advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross	46,282	46,282
Accumulated Amortization	(24,976)	(21,820)
Net	$ 21,306	24,462
Estimated useful lives (in years)	11 years
Trade names and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	$ 114,869	115,873
Accumulated Amortization	(37,705)	(19,708)
Net	$ 77,164	$ 96,165
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