Acquisitions and Dispositions - Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2018	Oct. 29, 2018
Assets Acquired:
Current assets	$ 0
Property and equipment	11	$ 25
Other assets:
Broadcast licenses	46	61
Goodwill	143	124
Other intangibles, deferred costs and investments	0
Total other assets	189	185
Total assets acquired	200	210	$ 9,300
Liabilities Assumed:
Current liabilities	0
Total liabilities assumed	0
Net assets acquired	$ 200	$ 210