Goodwill and Intangible Assets - Indefinite Lived Net Balance (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Changes in the goodwill
Net balance at the beginning of the period	$ 169,994
Additions	74
Net balance at the end of the period	170,068
Changes in the goodwill and other indefinite lived intangible assets, on a net basis
Net balance at the beginning of the period	228,036
Additions	74
Net balance at the end of the period	228,110
Broadcast license
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
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