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Fair Value Measurements (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Broadcast licenses, net     $ 90,208,000 $ 90,307,000 $ 90,277,000
Impairment of intangible assets $ 1,400,000 $ 3,800,000 5,149,000    
Licensing Agreements          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Broadcast licenses, net     51,448,000    
Licensing Agreements | Non-Recurring Fair Value Measurements          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of broadcast licenses     $ 46,299,000