Broadcast Licenses, Goodwill and Other Intangible Assets (Amortizable intangible assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 16,320	$ 16,320
Accumulated Amortization	15,524	14,711
Net Amount	796	1,609
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,660	4,660
Accumulated Amortization	4,322	3,584
Net Amount	338	1,076
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,861	3,861
Accumulated Amortization	3,861	3,861
Favorable lease agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,965	5,965
Accumulated Amortization	5,570	5,539
Net Amount	395	426
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,834	1,834
Accumulated Amortization	1,771	1,727
Net Amount	$ 63	$ 107