Goodwill And Other Intangible Assets - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets not subject to amortization	$ 794,000	$ 794,000
Total other intangible assets, net (excluding goodwill)	1,777,360	1,819,134
Goodwill	3,228,047	3,227,930
Total goodwill and other intangible assets	5,005,407	5,047,064
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	1,587,674	1,587,548
Intangible assets, accumulated amortization	(604,314)	(562,414)
Intangible assets subject to amortization, net	983,360	1,025,134
FCC Licenses
Indefinite-lived Intangible Assets [Line Items]
Other intangible assets not subject to amortization	779,200	779,200
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	(56,313)	(53,000)
Intangible assets subject to amortization, net	$ 155,687	159,000
Affiliate Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	16 years
Affiliate Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
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	(89,250)	(84,000)
Intangible assets subject to amortization, net	$ 78,750	84,000
Advertiser relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	8 years
Advertiser relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	8 years
Network Affiliation Agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 362,000	362,000
Intangible assets, accumulated amortization	(144,128)	(133,725)
Intangible assets subject to amortization, net	$ 217,872	228,275
Network Affiliation Agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	5 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	(309,504)	(286,994)
Intangible assets subject to amortization, net	$ 520,596	543,106
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
Trade Names and trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 4,876	4,802
Intangible assets, accumulated amortization	(606)	(516)
Intangible assets subject to amortization, net	$ 4,270	4,286
Trade Names and trademarks | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	15 years
Trade Names and trademarks | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)	15 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, gross	$ 10,698	10,646
Intangible assets, accumulated amortization	(4,513)	(4,179)
Intangible assets subject to amortization, net	$ 6,185	$ 6,467
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)	12 years