Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands		9 Months Ended
	Apr. 04, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Acquisition of intangible assets		$ 24,475	$ 7,229
Indefinite-lived intangible assets - FCC licenses		354,615		$ 157,215
Value of finite-lived intangible assets		812,643		437,337
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year		14,900
Finite-Lived Intangible Assets, Amortization Expense, Year One		55,900
Finite-Lived Intangible Assets, Amortization Expense, Year Two		53,100
Finite-Lived Intangible Assets, Amortization Expense, Year Three		48,300
Finite-Lived Intangible Assets, Amortization Expense, Year Four		43,300
Finite-Lived Intangible Assets, Amortization Expense, Year Five		41,500
Finite-Lived Intangible Assets, Amortization Expense, after Year Five		409,400
Independent Station in Florida
Acquisition of intangible assets	$ 23,600
Indefinite-lived intangible assets - FCC licenses | Independent Station in Florida
Indefinite-lived intangible assets - FCC licenses	19,200
Other intangible asset
Value of finite-lived intangible assets		$ 108,767		$ 88,393
Other intangible asset | Independent Station in Florida
Value of finite-lived intangible assets	$ 4,100