Goodwill and Intangible Assets - Indefinite Lived Net Balance (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Changes in the goodwill
Net balance at the beginning of the period	$ 165,597
Net balance at the end of the period	236,764
Changes in the goodwill and other indefinite lived intangible assets, on a net basis
Net balance at the beginning of the period	223,639
Additions	71,167
Net balance at the end of the period	294,806
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 the goodwill
Net balance at the beginning of the period	165,597
Additions	71,167
Net balance at the end of the period	236,764
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