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Summary of Significant Accounting Policies (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 11, 2019
$ / shares
Sep. 12, 2019
$ / shares
Mar. 04, 2019
$ / shares
May 30, 2019
$ / shares
Feb. 26, 2019
$ / shares
Jun. 30, 2020
USD ($)
item
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
segment
item
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Summary Of Significant Accounting Policies [Line Items]                  
Number Of FM Radio Stations | item               79  
Number Of AM Radio Stations               34  
Number Of Metro Signals               78  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares           0 0 0 0
Number of Reportable Segments | item               27  
Special cash dividend declared on Classes A and B Common Stock | $ / shares           $ 0 $ 0.30 $ 0.32 $ 0.60
Number Of Market Serving | item           27   27  
Stock Repurchase Program, Remaining Authorized Repurchase Amount           $ 19,200   $ 19,200  
Stock Repurchase Program, Authorized Amount           75,800   75,800  
Operating Lease, Right-of-Use Asset           6,500 $ 5,900 6,500 $ 5,900
Operating Lease, Liability           $ 6,795 $ 6,100 $ 6,795 $ 6,100
Number of operating segments | segment               1  
Customer relationships [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Finite-Lived Intangible Asset, Useful Life               3 years  
Class A Common Stock                  
Summary Of Significant Accounting Policies [Line Items]                  
Special cash dividend declared on Classes A and B Common Stock | $ / shares $ 0.30 $ 0.30 $ 0.32 $ 0.30 $ 0.30