Intangible Assets and Goodwill - Goodwill, FCC Licenses and Other Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, Gross	$ 2,993,608	$ 3,129,169
Goodwill, Accumulated Impairment	(132,294)	(132,294)
Goodwill, Net	2,861,314	2,996,875
Goodwill Current year acquisitions, Gross	7,643
Goodwill Current year acquisitions, Net	7,643
Goodwill Current year divestitures, Gross	(48,429)
Goodwill Current year divestitures, Net	(48,429)
Measurement period adjustments, Gross	(94,775)
Measurement period adjustments, Net	(94,775)
FCC Licenses [Abstract]
FCC Licenses, Gross	2,903,784	2,968,875
FCC Licenses, Accumulated Impairment	(47,410)	(47,410)
FCC Licenses, Net	2,856,374	$ 2,921,465
FCC Licenses Current year acquisitions, Gross	39,217
FCC Licenses Current year acquisitions, Net	39,217
FCC Licenses Current year divestitures, Gross	(104,308)
FCC Licenses Current year divestitures, Net	$ (104,308)