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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) item segment $ / shares shares | Mar. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2023 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of market serving | item | 27 |  |
Number of FM radio stations | item | 79 |  |
Number of AM radio stations | 31 |  |
Number of metro signals | 78 |  |
Antidilutive securities excluded from computation of earnings per share, amount | shares | 0 | 0 |
Debt securities, held to maturity | $ 8,600,000 |  | $ 10,600,000
Securities at fair value | 8,600,000 |  | 10,600,000
Allowance for credit losses | $ 913,000 |  | $ 618,000
Number of Radio Markets | item | 27 |  |
Dividends declared per share (in dollars per share) | $ / shares | $ 0.85 | $ 0.25 |
Cash dividends paid | $ 14,068,000 | $ 13,754,000 |
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Customer relationships |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful life | 3 years |  |

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