Goodwill And Other Intangible Assets - (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets not subject to amortization	$ 752,000	$ 752,000
Total other intangible assets, net (excluding goodwill)	1,370,614	1,442,456
Goodwill	3,228,547	3,228,601
Total goodwill and other intangible assets	4,599,161	4,671,057
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	1,447,709	1,454,815
Intangible assets, accumulated amortization	(829,095)	(764,359)
Intangible assets subject to amortization, net	618,614	690,456
FCC Licenses
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets not subject to amortization	737,200	737,200
Trade Names
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets not subject to amortization	14,800	14,800
Affiliate Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	212,000	212,000
Intangible assets, accumulated amortization	(86,125)	(79,500)
Intangible assets subject to amortization, net	$ 125,875	132,500
Useful life (years)	16 years
Advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 168,000	168,000
Intangible assets, accumulated amortization	(136,500)	(126,000)
Intangible assets subject to amortization, net	$ 31,500	42,000
Useful life (years)	8 years
Network Affiliation Agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 228,700	228,700
Intangible assets, accumulated amortization	(91,154)	(83,649)
Intangible assets subject to amortization, net	$ 137,546	145,051
Network Affiliation Agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	11 years
Network Affiliation Agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	16 years
Retransmission Consent Agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 830,100	830,100
Intangible assets, accumulated amortization	(512,092)	(467,073)
Intangible assets subject to amortization, net	$ 318,008	363,027
Retransmission Consent Agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	7 years
Retransmission Consent Agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	12 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 8,909	16,015
Intangible assets, accumulated amortization	(3,224)	(8,137)
Intangible assets subject to amortization, net	$ 5,685	$ 7,878
Other Intangible Assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	5 years
Other Intangible Assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	15 years