Goodwill and Intangible Assets - Indefinite Lived Net Balance (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Changes in other indefinite-lived intangible assets
Additions	$ 144,485
Changes in the goodwill
Net balance at the beginning of the period	165,597
Net balance at the end of the period	310,082
Changes in the goodwill and other indefinite lived intangible assets, on a net basis
Net balance at the beginning of the period	223,639
Net balance at the end of the period	368,124
Broadcast licenses
Changes in other indefinite-lived intangible assets
Net balance at the beginning of the period	41,356
Net balance at the end of the period	41,356
Goodwill
Changes in other indefinite-lived intangible assets
Additions	144,485
Changes in the goodwill
Net balance at the beginning of the period	165,597
Net balance at the end of the period	310,082
Brands
Changes in other indefinite-lived intangible assets
Net balance at the beginning of the period	15,986
Net balance at the end of the period	15,986
Other intangibles
Changes in other indefinite-lived intangible assets
Net balance at the beginning of the period	700
Net balance at the end of the period	$ 700