Goodwill and Other Intangible Assets - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 2,635,847	$ 2,596,863
Goodwill, accumulated amortization	0	0
Total indefinite-live and amortizable intangible assets	1,775,508	1,645,035
Total indefinite-live and amortizable intangible assets, accumulated amortization	(136,469)	(118,958)
Retransmission agreements
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets	133,847	121,594
Amortizable intangible assets, accumulated amortization	(88,228)	(79,274)
Network affiliation agreements
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets	126,494	110,390
Amortizable intangible assets, accumulated amortization	(38,057)	(30,802)
Other
Goodwill and Intangible Assets Disclosure [Line Items]
Amortizable intangible assets	77,602	28,865
Amortizable intangible assets, accumulated amortization	(10,184)	(8,882)
Television and radio station FCC licenses
Goodwill and Intangible Assets Disclosure [Line Items]
Indefinite-lived intangibles	$ 1,437,565	$ 1,384,186