Related Party Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2013	Jan. 31, 2012
Stephen Adams
Related party transactions
Payments to related party for purchasing advertising services		$ 0	$ 200	$ 200
Mr. Lemonis
Related party transactions
Related party expense		0		400
Related Party Agreement | Andris A. Baltins
Related party transactions
Related party expense		200	300	300
Related Party Agreement | Precise Graphix
Related party transactions
Related party expense		300	1,400	5,600
Advertising Agreement | Cumulus Media
Related party transactions
Related party expense				300
FreedomRoads | Lease Agreement | Managers and Officers
Related party transactions
Related party expense		$ 2,000	2,200	$ 1,900
FreedomRoads | Lease Agreement | Mr. Lemonis
Related party transactions
Base rent					$ 31,500	$ 29,000
Additional monthly base rent	$ 5,200
Mr. Lemonis
Related party transactions
Related party expense			$ 0
Mr. Lemonis | Precise Graphix
Related party transactions
Economic interest (as a percent)		67.00%
Mr. Lemonis | JD Custom | Mr. Lemonis
Related party transactions
Indirect interest		52.00%
Stephen Adams | Adams Radio | Stephen Adams
Related party transactions
Indirect interest		90.00%