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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

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