Broadcast Licenses, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Balance				$ 88,106				$ 86,762		$ 88,106	$ 86,762
Acquisitions										8,123	2,218
Impairment charge	$ 0	$ 0	$ 0	0	$ 874	$ 0	$ 0	0	$ 1,936	0	874	$ 1,936
Balance	96,229				88,106				86,762	96,229	88,106	86,762
Radio [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance				78,499				77,155		78,499	77,155
Acquisitions										8,123	2,218
Impairment charge											(874)
Balance	86,622				78,499				77,155	86,622	78,499	77,155
Television [Member]
Indefinite-lived Intangible Assets [Line Items]
Balance				$ 9,607				$ 9,607		9,607	9,607
Acquisitions										0	0
Impairment charge											0
Balance	$ 9,607				$ 9,607				$ 9,607	$ 9,607	$ 9,607	$ 9,607