Broadcast Licenses, Goodwill and Other Intangible Assets (Changes to broadcast licenses) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Broadcast Licenses, Goodwill and Other Intangible Assets
Balance			$ 90,307	$ 90,277
Acquisitions				30
Disposals			(67)
Impairment charge	$ 0	$ 0
Balance	$ 90,307	$ 90,277	$ 90,240	$ 90,307