Goodwill (Tables)
   | 
12 Months Ended | 
Dec. 31, 2020  | 
| Schedule of Changes in Goodwill | 
The following table presents the changes in goodwill including business acquisitions as described in Note 3—Recent Transactions.     
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Year Ended December 31,  | 
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    2019     | 
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(Dollars in thousands)  | 
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Balance, beginning of period before cumulative loss on impairment,  | 
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$ | 
28,818 | 
  | 
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$  | 
28,454 | 
   | 
 
Accumulated loss on impairment  | 
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(2,029 | 
)  | 
   | 
   | 
(4,456 | 
)   | 
 
|   | 
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   | 
   | 
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   | 
 
Balance, beginning of period after cumulative loss on impairment  | 
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26,789 | 
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   | 
23,998 | 
   | 
 
|   | 
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   | 
 
Acquisitions of digital media entities  | 
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6 | 
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   | 
66 | 
   | 
 
Disposition of radio stations  | 
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(29 | 
)  | 
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   | 
—    | 
   | 
 
Disposition of digital media entities  | 
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(341 | 
)  | 
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   | 
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   | 
 
Impairments based on the estimated fair value goodwill  | 
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(2,427 | 
)  | 
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   | 
(307 | 
)   | 
 
|   | 
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   | 
   | 
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   | 
 
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$ | 
23,998 | 
  | 
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$  | 
23,757 | 
   | 
 
|   | 
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   | 
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   | 
 
Balance, end of period before cumulative loss on impairment  | 
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28,454 | 
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   | 
28,520 | 
   | 
 
Accumulated loss on impairment  | 
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  | 
(4,456 | 
)  | 
   | 
   | 
(4,763 | 
)   | 
 
|   | 
   | 
   | 
   | 
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   | 
 
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$ | 
23,998 | 
  | 
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$  | 
23,757  | 
   | 
 
|   | 
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   | 
 
            
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| Broadcast Markets Enterprise Valuations [Member] | 
 
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| Carrying Value and Fair Value of Financial Instrument Disclosure | 
The tables below present the percentage within a range by which the estimated fair value exceeded the carrying value of each of our market clusters, including goodwill:     
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Broadcast Market Clusters as of December 31, 2020  | 
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Percentage Range By Which Estimated Fair Value Exceeds Carrying Value Including Goodwill  | 
   | 
 
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|   | 
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Number of accounting units  | 
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   | 
1  | 
   | 
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   | 
—    | 
   | 
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   | 
—    | 
   | 
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   | 
3  | 
   | 
 
Carrying value including goodwill ( in thousands )  | 
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   | 
8,386   | 
   | 
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   | 
—    | 
   | 
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   | 
—    | 
   | 
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   | 
43,617  | 
   | 
 
               
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| Schedule of Assumptions Used | 
The key estimates and assumptions used for our enterprise valuations were as follows:     
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Broadcast Markets Enterprise Valuations  | 
   | 
December 31, 2019 | 
   | 
December 31, 2020  | 
 
Risk-adjusted discount rate  | 
   | 
9.0% | 
   | 
8.5%  | 
 
Operating profit margin ranges  | 
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(31.1%) - 38.7% | 
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(11.4%) - 41.5%  | 
 
Long-term revenue growth rates  | 
   | 
0.7% -0.9% | 
   | 
0.5% - 0.8%  | 
 
            
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| Digital Media [Member] | 
 
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| Carrying Value and Fair Value of Financial Instrument Disclosure | 
The table below presents the percentage within a range by which the estimated fair value exceeded the carrying value of the digital media entities, including goodwill.     
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Digital Media Entities as of December 31, 2020  | 
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|   | 
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Percentage Range By Which Estimated Fair Value Exceeds  Carrying Value Including Goodwill | 
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|   | 
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< 10% | 
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>10% to 20% | 
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>21% to 50% | 
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> than 51% | 
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Number of accounting units  | 
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1  | 
   | 
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   | 
—  | 
   | 
 
Carrying value including goodwill ( in thousands )  | 
   | 
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  | 
  | 
   | 
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   | 
3,164  | 
   | 
   | 
   | 
—  | 
   | 
 
            
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| Schedule of Assumptions Used | 
The key estimates and assumptions used for our enterprise valuations were as follows:     
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Digital Media Enterprise Valuations  | 
   | 
December 31, 2019 | 
  | 
December 31, 2020  | 
 
Risk adjusted discount rate  | 
   | 
10.0% | 
  | 
9.5%  | 
 
Operating profit margin ranges  | 
   | 
3.7% - 28.8%  | 
  | 
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Long-term revenue growth rates  | 
   | 
0.5% -1.0% | 
  | 
1.0%  | 
 
            
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| Publishing [Member] | 
 
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| Carrying Value and Fair Value of Financial Instrument Disclosure | 
The table below presents the percentage within a range by which the estimated fair value exceeded the carrying value of our remaining accounting units, including goodwill.     
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Publishing Entities as of December 31, 2020  | 
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|   | 
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Percentage Range By Which Estimated Fair Value Exceeds  Carrying Value Including Goodwill  | 
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|   | 
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< 10% | 
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>11% to 20% | 
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>21% to 50% | 
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> than 51% | 
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Number of accounting units  | 
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   | 
1  | 
   | 
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   | 
—    | 
   | 
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   | 
—    | 
   | 
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   | 
1  | 
   | 
 
Carrying value including goodwill ( in thousands )  | 
   | 
   | 
2,282  | 
   | 
   | 
   | 
—    | 
   | 
   | 
   | 
—    | 
   | 
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   | 
391  | 
   | 
 
            
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| Schedule of Assumptions Used | 
The key estimates and assumptions used for our enterprise valuations were as follows:     
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Publishing Enterprise Valuations  | 
   | 
December 31, 2019 | 
   | 
March 31, 2020 | 
   | 
December 31, 2020  | 
 
Risk adjusted discount rate  | 
   | 
10.0% | 
   | 
10.5% | 
   | 
9.5%  | 
 
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1.5% - 3.9%  | 
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0.0% - 3.9%  | 
   | 
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Long-term revenue growth rates  | 
   | 
0.5% | 
   | 
0.5% | 
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